Pochuck Mountain and Wawayanda Mountain to the east form the borders of the Vernon Valley, an important farming and mining area of New Jersey drained by Pochuck Creek. Immediately to the northwest of the ridge lies the Black Dirt Region, which is drained by the Wallkill River. Both valleys are part of an elongated lowland region known as the Great Appalachian Valley that divides the Appalachian Mountains for hundreds of miles. Due to the unusual positioning of Pochuck Mountain relative to the neighboring mountains, the Vernon Valley is a somewhat isolated prong of the rest of the Great Appalachian Valley.