The Catskill Mountains, between Albany and Ulster counties, are not true geological mountains. The range is actually a dissected plateau, an uplifted region that has been eroded into sharp relief. They are an eastward continuation, and the highest representation, of the Allegheny Plateau. The Catskills contain more than 30 peaks above 3,500 feet. The highest mountain, Slide Mountain in Ulster County, has an altitude of 4,180 feet (1,274 m).

Sorry googled it........

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