Original sentence: It is 4,239 acres (17 km²) in area, located in northwestern New Jersey, in northern Warren County, south of Hope Township, on the north flank of Jenny Jump Mountain
Edited sentence: It is 4,239 acres (17 km²) in area, located in northwestern New Jersey, in northern Warren County, south of Hope Township, on the northwest flank and south end of  Jenny Jump Mountain — a  long ridge