North of the villages of Cold Spring and Nelsonville is the central and largest section. Starting at the Little Stony Point area along the river, which is separated from the rest of the parcel by the easement for the New York City water supply system's Catskill Aqueduct, this section contains Bull Hill and Breakneck Ridge, with Breakneck Brook between them, then sprawls into Dutchess County, where it includes Pollepel Island, Sugarloaf Mountain, the south summit of Beacon Mountain and Beacon Reservoir, reaching its northern terminus at the Dry Brook trailhead at the end of Pocket Road in the city of Beacon. It is complemented by Storm King State Park across the river.