Marlboro Mountains

The Marlboro Mountains, sometimes Marlborough Mountains, are a group of hogbacked mountains arranged in a 25-mile-long ridge extending from Newburgh, New York, to just south of Kingston, New York. Considered to be part of the Ridge and Valley Appalachians, the mountains, which reach elevations over 1,100 feet, form an imposing geologic barrier just west of the Hudson River. They subdivide the relatively flat Hudson River Valley to create the Wallkill Valley further west. Rising abruptly on their eastern flanks, the Marlboro Mountains are known for their sweeping views of the region.

The Marlboro Mountains form a broken ridgeline running from the Ulster–Orange County border in the south to the mouth of Rondout Creek in the north. The southernmost 9 miles of the ridge form Marlboro Mountain, the namesake mountain of the range. Just north of the Marlboro Mountain ridge is Bailey's Gap, which separates Marlboro Mountain from the 3 1⁄2-mile-long Illinois Mountain. North of Illinois Mountain there is a half-mile-wide break in the ridgeline before it slowly rises to a series of unnamed hilltops west of West Park, New York. North of this section is Shaupeneak Mountain, which bends to the north-northwest before reaching an area known as The Hell, a gap in the ridge through which a creek flows. North of this gap is Hussey Hill, which stretches to an area west of Port Ewen, New York, marking the northernmost limit of the Marlboro Mountains.

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