Since the town is entirely within the Catskill Park, large tracts of land are owned by the state Department of Environmental Conservation as part of New York's Forest Preserve. These forests are either in the Sundown Wild Forest in the eastern parts of the town or the Slide Mountain Wilderness Area in its central regions. Within the former are the three southernmost Catskill High Peaks: Peekamoose, Table and Lone mountains. At 3,847 feet (1,173 m), Table's summit is the highest point in the town. Slide Mountain, the highest peak in the Catskills, is north of Denning.