Petticoat Hill rises nearly above downtown Williamsburg; its subordinate summits include Scott Hill, 1,027 ft (313 m), on which are located the reservation and trails; and Unquomonk Hill, (1,083 ft (330 m). The east and south sides of Petticoat Hill drain into Unquomonk Brook, thence into the Mill River, the Connecticut River, and Long Island Sound. The north and west sides of the hill drain into Meekin Brook, thence into the Mill River.