The northeast side of Doubletop Mountain drains into the headwaters of Dry Brook, thence into the East Branch of the Delaware River.

The southwest side of Doubletop drains into the headwaters of Beaver Kill, thence into the East Branch of the Delaware River.

The south end of Doubletop drains into High Falls Brook, thence into the West Branch of the Neversink River, and the Delaware River.

Doubletop Mountain is within of New York's Catskill State Park.

This article about a location in Ulster County, New York is a stub.