The Siamese Ponds Wilderness Area, an Adirondack Park unit of the Forest Preserve, is located in the towns of Lake Pleasant, Wells and Indian Lake in Hamilton County and the towns of Johnsburg and Thurman in Warren County. It is one of the larger wilderness areas of the Northeast; extending about 18 miles (29 km) from north to south and about 13 miles (21 km) from east to west at its widest part.