Berlin Mountain, 2,818 feet (859 m), is a prominent peak in the Taconic Mountains of western New England and is located adjacent to Massachusetts's border with New York State. It is the highest point in Rensselaer County, and the highest mountain in New York outside of the Adirondacks and Catskills.The summit and west side of the mountain are located in New York; the east side lies within, Williamstown Massachusetts. The mountain is a bald, notable for its grassy summit and expansive views of the Hudson River Valley to the west. The 35 mi (56 km) Taconic Crest Trail traverses the mountain. Several other hiking trails approach the summit from the east.