All that area bounded by a line commencing at the intersection of Route 13 and Bowman Hill Road; thence easterly along Bowman Hill Road to Moss Hill Road; thence easterly along Moss Hill Road to Ormisten Road; thence due east to Erin-Horseheads town line; thence counterclockwise along the Horseheads town line to Ridge Road; thence northerly along Ridge Road to Smith Road; thence westerly along Smith Road to Route 14; thence due west to the Catlin-Veteran town line; thence clockwise along the Catlin town line to Barnes Hill Road; thence southerly along Barnes Hill Road to the Power Transmission Lines; thence southwesterly along the Power Transmission Lines to the Chemung-Steuben county line; thence southerly along the county line to the Chemung River; thence easterly along a straight line to the intersection of Route 17E and Carpenter Road; thence northeasterly along Carpenter Road to Big Flats Road; thence northeasterly along Big Flats Road to the Erie-Lackawanna Railroad; thence easterly along the Erie-Lackawanna Railroad to the Big Flats-Horseheads town line; thence due east to Philo Road; thence southerly along Philo Road to Halderman Hollow Road; thence westerly along Halderman Hollow Road to Golf Course Road; thence southerly along Golf Course Road to the Elmira Heights village line; thence southerly along the village line to the Elmira-Horseheads town line; thence southerly along a straight line to the intersection of Reformatory Road and the Elmira city line; thence counterclockwise along the city line to Hillcrest Road; thence westerly along Hillcrest Road to the Big Flats-Elmira town line; thence southerly along the town line to Route 17E; thence northwesterly along Route 17E to a point due north of the intersection of Hendy Creek and Big Flats-Southport town line; thence due south to said point; thence easterly along the town line to the Chemung River; thence easterly along the Chemung River to the Elmira city line; thence due southwest to Dry Run; thence southeasterly along Dry Run to Seeley Creek; thence easterly along Seeley Creek to the Chemung River; thence due east to Route 17; thence northerly along Route 17 to Route 13; thence northerly along Route 13 to the beginning point; except that area delineated as Level III.