Mоussa Diallo petitions for review of the March 13, 1998 order of the Board of Immigration Appeals (“BIA”) dismissing his appeal from the denial by an immigration judge (“IJ”) of his applications for asylum in the United States and withholding of deportation to Mauritania. 1 Specifi *283 cally, Diallo argues that the BIA erred by requiring him to corroborate his allegedly credible testimony with specific documentary support and then determining, based on his failure to provide this corroboration, that he had failed to meet his burden of proof. In opposition, respondent Immigration and Naturalization Service (“INS”) contends that the BIA apрlied the proper standard in assessing Diallo’s claims and that substantial evidence supports the BIA’s ultimate decision to deny his applications.
For the reasons that follow, we conclude that the BIA has articulated an appropriate standard concerning corroboration in asylum and withholding of deportation cases but that it erred in several fundamental ways in applying that standard to the facts of this case. Therefore, we grant the petition for review, vacate the BIA’s order, and remand with specific guidance as to how the BIA should approach questions of credibility and corroboration to avoid repeating these errors on remand here and in subsequent cases.
BACKGROUND
In February 1994, Diallo illegally entered the United States. In October 1995, he applied for asylum and withholding of deportation under former sections 208 and 243(h) of the Immigration and Nationality Act (“INA”), 8 U.S.C. §§ 1158(a) (amended 1996), 1253(h) (repealed 1996), 2 based on his past persecution and fear of future race-based persecution in his native country of Mauritania. In December 1995, the INS charged Diallo with unlawful entry without inspection and referred him to the immigration courts for a hearing.
At his June 1996 deportation hearing, Diallо put before the IJ materials from various sources, including the State Department. According to these materials, the white-dominated government of Mauritania engaged in massive human rights abuses against its black citizens between 1989 and 1992. The government expelled about 70,000 blacks from the country— claiming in many cases that they were Senegalese — and forced many of them into refugee camps in neighboring Senegal. Frequently, the deportations were preceded by destruction of proof of citizenship and expropriation of property, and often accompanied by mаss arrests, torture, and executions.
In addition to introducing the above materials in support of his applications, Diallo testified at the hearing. He described the conditions in Mauritania and his own experience in considerable detail. Specifically, he testified that he lived with his wife, parents, and siblings in Nouadhibou until June 1990, when several soldiers came to their home, tore up their identity papers, and forced the other members of his family to cross the nearby river into Senegal. Diallo alone was taken to a nearby village within Mauritania, where he was held prisoner along with other blacks and “half-blacks.” During this time, Diallo was repeatedly beaten and tortured and was required to perform forced labor. In December 1991, Diallo was taken halfway across the Senegal River by boat where he was thrown into the water and ordered to swim to the other side. A Senegalese fisherman rescued him and took him to the Senegalese shore. Diallo then walked to the United Nations refugee camp in Hore-fode, Senegal, where he was reunited with his family members and wife and remained until November 1993. After hearing reports that Senegal was sending refugees back to Mauritania, Diallo movеd to Dakar, Senegal’s capital, where he stayed for a short time earning money before traveling to the United States by boat.
*284 On July 24, 1996, the IJ denied Diallo’s applications. She found that, despite providing substantial independent evidence about the persecution of black Mauritanians during the period that he claimed persecution, Diallo had failed to meet his burden of proof because he did not produce adequate documentary corroboration of his testimony. According to the IJ, his “inability or unwillingness to provide supporting documentation ... seriously undermined] the plausibility of his account, particularly since he has not offered ... specific, credible detail about the circumstances” of his detention in Mauritania or residence at the refugee camp. 3
The BIA affirmed the IJ’s decision and dismissed Diallo’s appeal.
See In re MD-
Int. Dec. (BIA) 3339,
Two members of the BIA dissented in separate opinions. According to Chairman Schmidt, Diallo’s testimony alone was enough to meet his burden of proof because it was “believable, consistent, and sufficiently detailed to provide a plausible and coherent account of the basis of [his] alleged fear” of persecution.
Id.
DISCUSSION
Diallo applied both for asylum and for withholding of deportation, each of which implicates a different burden of proof. In order to demonstrate eligibility for asylum, Diallo must show that he has suffered past persecution or has a well-founded fear of future persecution on the basis of race.
See Abankwah v. INS,
Demonstrating eligibility for withholding of deportation requires carrying a higher burden: Diallo must establish a clear probability that his “ ‘life or freedom would be threatened in [a] country on account of ” his race.
Id.
(quoting 8
*285
U.S.C. § 1253(h)(1) (1994)) (alteration in original). However, if the applicant shows that he or she suffered “persecution in the past such that his or her life or freedom was threatened,” then it is presumed that his or her life or freedоm would be threatened upon return “unless a preponderance of the evidence establishes that conditions in the country have changed to such an extent that it is no longer more likely than not that the applicant would be so persecuted there.” 8 C.F.R. § 208.16(b)(2). Once the required showing is made, no discretion lies with the Attorney General; the application for withholding of deportation must be granted.
See Abankivah,
The BIA concluded that Diallo had failed to sustain his burden of proof with respect to either of his applications, mainly because he had presented neither specific corroborative evidence nor an adequate explanation for the absence of such evidence in addition to his detailed testimony about his experiences and general documentary evidence about conditions in his native country. We believe that the BIA employed the proper standard for evaluating whether Diallo had met his burden of proof but erred in several fundamental respects in applying that standard in this case. Below, we discuss our reasons for accepting the BIA’s corroboration standard, detail the flaws in the BIA’s application of that standard, and рoint out what we believe to be the correct approach to questions of credibility and corroboration in this context.
I.
In its decision, the BIA articulated the following standard concerning the need for corroboration in asylum and withholding of deportation cases:
[W]here an alien’s testimony is the only evidence available, it can suffice where [it] is believable, consistent, and sufficiently detailed to provide a plausible and coherent account of the basis of the alien’s alleged fear. However, ... the introduction of [supporting] evidence is not purely an option with the asylum applicant; rather, corroborating evidence should be presented where available.
... [W]here the record contains general country information, and an applicant’s claim relies primarily on personal experiences not reasonably subject to verification, corroborative documentary evidence of the asylum applicant’s particular experience is not required. However, ... where it is reasonable to expect corroborating evidence for certain alleged facts pertaining to the specifics of an applicant’s claim, such evidence should be provided or an explanation should be given as to why such information was not presented. The absence of such corroboration can lead to a finding that an applicant has failed to meet his burden of proof.
In re M-D-,
Pursuant to
Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc.,
First, the INS rеgulations state that “[t]he testimony of the applicant, if credible, may be sufficient to sustain the burden of proof without corroboration.” 8 C.F.R. §§ 208.13(a), 208.16(b). The BIA’s interpretation of these provisions is consistent with the language and purpose of the regulations. The use of the permissive term “may” implies that an applicant’s credible testimony may not always satisfy the burden of proof. Moreover, the regulations were apparently drafted to ensure that lack of corroboration would not necessarily defeat an asylum claim, see Aliens and Nationality; Asylum and Withholding of Deportation Procedures, 52 Fed. Reg. 32,552, 32,553 (1987) (to be codified at various parts of 8 C.F.R.) (proposed Aug. 28, 1987), not to excuse the requirement of corroboration in all cases in which an applicant’s testimony is credible.
Second, international standards do not conflict with the BIA’s expectation of corroborating evidence in certain cases. The Handbook of the United Nations High Commissioner for Refugees (“Handbook”) notes that applicants should “[m]ake an effort to support [their] statements by any available evidence and give a satisfactory explanation for any lack of evidenсe.” Office of the United Nations High Commissioner for Refugees,
Handbook on Procedures and Criteria for Determining Refugee Status Under the 1951 Convention and the 1967 Protocol Relating to the Status of Refugees
¶205(ii) (Geneva 1992). The Handbook, however, also recognizes that applicants “may not be able to support [their] statements by documentary or other proof’ and thus should “be given the benefit of the doubt” where their “account appears credible.”
Id.
¶ 196. The standard applied by the BIA adheres to these general parameters, which the BIA has explicitly cited and relied upon.
See, e.g., In re S-M-J-,
Third, the stаndard applied by the BIA is consistent with our precedent. Although we have used language that could be interpreted more broadly,
see Abankwah,
Accordingly, the petitioner and the ami-cus overstate the breadth of the regulations, international standards, and our precedent when they claim, without elaboration оf the circumstances when it is so, that an alien’s credible testimony is sufficient to meet his or her burden of proof. Rather, the appropriate formulation is that credible testimony may be enough, depending on the circumstances.
II.
Nevertheless, several fatal flaws in the BIA’s application of this standard to the facts of this case undermine its ultimate decision and require vacatur and remand.
*287
We review the factual findings underlying the BIA’s determination that an alien has failed to sustain his or her burden of proof to qualify for asylum or withholding of deportation under the substantial evidence standard.
See Melgar de Torres v. Reno,
By contrast, when review involves mixed questions of law and fact, the standard of review is far less deferential. Thus, when the situation presented is the BIA’s application of legal principles to undisputed facts, rather than its underlying determination of those facts or its interpretation of its governing statutеs, “our review of the BIA’s asylum and withholding of deportation determinations is
de novo.” Singh v. Ilchert,
We see no reason to question any of the BIA’s factual determinations here. Upon de novo review of the BIA’s application of its corroboration standard in this case, however, we conclude that its decision cannot be sustained because the BIA failed to: (1) rule explicitly on the credibility of Diallo’s testimony; (2) explain why it was reasonable in this case to expect additional corroboration; or (3) assess the sufficiency of Diallo’s explanations for the absence of corroborating evidencе. We elaborate on each of these below.
A.
First, the BIA made no pronouncement on the credibility of Diallo’s underlying testimony or of his explanations for the lack of additional corroborating evidence. It is “well established” that the BIA attaches “significant weight to the credibility of an asylum applicant.”
In re O-D-,
Int. Dec. No. 3334,
The government argues that the BIA made a supportable adverse credibility finding here. We disagree. To be sure, the IJ found that Diallo’s failure to provide corroborative evidence “seriously undermine[s] the plausibility of his account, particularly since he has not offered ... specific, credible detail about” his experiences. The BIA noted and did not disturb the IJ’s finding.
See In re M-D-,
But this finding does not withstand even deferential review. On the record befоre us, we think the IJ was plainly in error to find that Diallo failed to provide “specific, credible detail” in his testimony. Moreover, we agree with the petitioner that it is inappropriate to base a credibility determination solely on the failure to provide corroborative evidence. The presence or absence of corroboration may properly be considered in determining credibility.
Cf. Outley v. City of New York,
At the same time, we cannot agree with the petitioner that the BIA implicitly found his testimony credible or that its failure to make a negative assessment amounts to а finding of credibility. There are certain inconsistencies in Diallo’s story that give us pause. First, his application for asylum lists Niabina as his place of birth and residence, whereas in his testimony he stated that he was born and resided in Nouadhibou. His testimony also implies that he lived near the Senegal River, whereas Nouadhibou is a port city about 400 miles from the River and nowhere near the border with Senegal. Second, his application lists December 1989 as the date of his arrest, but he testified that soldiers came to his house and arrested him in June 1990. Third, there are other inconsistencies concerning the аmount of time he spent both in prison and in the refugee camp.
Where an applicant’s testimony is generally consistent, rational, and believable, disparities like the ones listed above need not be fatal to credibility, especially if the errors are relatively minor and isolated,
see In re A-S-
Int. Dec. No. 3336,
B.
Second, we are not convinced that, under the BIA’s own precedent, it was reasonable to expect additional corroboration beyond the materials supplied by Diallo. Corroboration in this context typically includes both evidence of general country conditions and evidence that substantiates the applicant’s particular claims.
See, e.g., In re S-M-J-,
Corroboration of the specifies of an applicant’s personal experiences may also be reasonably expected, but only under certain circumstances. According to the BIA, specific documentary corroboration is required only for
material facts which are central to [the applicant’s] claim and easily subject to verification, such as evidence of his or her place of birth, media accounts of large demonstrations, evidence of a publicly held office, or documentation of medical treatment. If the applicant does not provide such information, an explanation should be given....
In re S-M-J-,
As an initial matter, Diallo plainly provided substantial corroboration of the specifics of his story. Although Diallo was functionally illiterate, on cross-exаmination he was able to describe the Mauritanian flag accurately and indicate basic knowledge of ethnic groups and tensions in Mauritania, thereby corroborating his claim of Mauritanian citizenship. He also displayed the scars he allegedly received at the hands of prison guards.
Nevertheless, the BIA listed four forms of additional corroboration that, in its view, Diallo should reasonably have been able to provide: (1) proof of his Mauritanian citizenship; (2) letters or affidavits from his sister, who lives in Senegal outside the refugee camp and has been in contact with Diallo sincе he arrived in the United States; (3) letters or affidavits from other family members to corroborate his claim that he was arrested and detained by the authorities while his family was expelled from Mauritania; and (4) confirmation of his or his family’s presence or registration at the refugee camp in Senegal.
See In re M-D-,
But the BIA did not explain why it was reasonable to expect provision of such materials under its own standards. Most importantly, we do not see how these materials were easily accessible to Diallo, given his functional illiteracy, the circumstances of his departure — which were not conducive to the calm assembly and preservation of documents to be used in future asylum proceedings,
see Senathirajah v. INS,
C.
Third, the BIA did not assess Diallo’s explanations for his failure to produce the requested corroborative evidence, but limited its analysis simply to the fact that the failure had occurred.
See id.
The BIA only casually acknowledged the UNHCR’s general explanation and, more importantly, wholly failed to acknowledge Diallo’s own particular explanations for his inability to provide further corroboration. The BIA’s failure to address Diallo’s explanations violates both the letter and spirit of its own standard, which specifically provides that, even under circumstances where corroboration may reasonably be expected, petitioners may meet their burden of proof by offering a believable and sufficient explanation as to why such cor
*290
roborating evidence was not presented.
See In re M-D-,
III.
In practice, the BIA’s standard requires a twofold determination. First, the agency must determine whether the applicant’s testimony is credible. In making this determination, the presence of corroborating evidence may be relevant. Second, the agency must determine whether the applicant has met his or her burden of proof. Here, too, corroborating evidence (or an explanation for its absence) may be required if it would reasonably be expected, even where the applicant’s testimony is credible. In this case, in the absence of an explicit credibility finding, an explanation of the need for additional corroboration, and an assessment of Diallo’s reasons for his failure to produce further corroboration, we conclude that the BIA’s ultimate ruling cannot stand; Therefore, we vacate and remand with the fоllowing instructions to the BIA, which may, in turn, remand to the IJ to make any of the required findings in the first instance.
First, the BIA should decide explicitly whether or not Diallo’s testimony was credible. This determination may properly be based on a credibility finding by the IJ, should the BIA choose to remand to allow the IJ to make such a finding.
Cf. In re A-S-
Sеcond, if the BIA finds that Diallo’s testimony was credible, it should decide whether additional corroboration is nonetheless required to meet his burden of proof. If the BIA insists on further corroboration, it should explain specifically, either in its decision or otherwise in the record: (1) why it is reasonable under the BIA’s standards to expect such corroboration; and (2) why Diallo’s proffered explanations for the lack of such corroboration are insufficient.
CONCLUSION
For the foregoing reasons, we conclude that: (1) the BIA’s corroboration standard is consistent with INS regulations, international standards, and the precedent of this court and is therefore entitled to deference; but (2) the BIA erred in several fundamental respects in applying that standard to the facts of this case. Accordingly, we grant the petition for review, vacate the BIA’s order, and remand for further proceedings consistent with this opinion.
Notes
. We note that Diallo's appeal is properly before this court. He petitions pursuant to former section 106(a) of the Immigration and Nationality Act ("INA”), 8 U.S.C. § 1105a(a), which was repealed by the Illegal Immigration Reform and Immigrant Responsibility Acl of 1996 ("IIRIRA”), Pub.L. No. 104-208, § 306(b), 110 Slat. 3009-546, 3009-612. Because Diallo's deportation рroceedings began before April 1, 1997 and his order of deportation became final after October 30, 1996, this case is governed by IIRIRA's transitional provisions.
See Henderson v. INS,
. Comparable relief remains available under the current immigration regime. See 8 U.S.C. §§ 1158 (asylum), 1231(b)(3) (withholding of removal).
. We note a distinction, sometimes elided by the INS, between credible testimony, in the context of which we use the term "credibility” here, and a plausible account, which might include testimony, corroborating evidence, and the like.
