Slide Mountain is the highest peak in the Catskill Mountains of the U.S. state of New York. It is located in the town of Shandaken in Ulster County. While the 4,180-foot contour line on topographic maps is generally accepted as its height, the exact elevation of the summit has never been officially determined by the U.S. National Geodetic Survey or its predecessors, and many informal surveys suggest the mountain may actually top 4,200 feet above sea level.