Ramapo Mountain State Forest is a 4,200 acre (17 km²) state forest in Bergen and Passaic Counties in New Jersey. The park is operated and maintained by the New Jersey Division of Parks and Forestry.
The park offers hiking, hunting, canoeing, fishing (including ice fishing), cross-country skiing, horseback riding and mountain biking. Several trails lead to views of the New York City skyline. The 1,417 acre (5.7 km²) Ramapo Lake Natural Area within the park has several trails to excellent views from rock outcroppings and ledges. A 120-acre (0.5 km2) mountain lake provides fishing and birdwatching (but no swimming).
The forest borders the Ramapo Valley County Reservation, a part of the Bergen County park system, and Ringwood State Park in Bergen and Passaic counties. It is part of a trail system which runs along the ridge of the Ramapo Mountains north through Mahwah, New Jersey and into Rockland County, New York.
In the 1920s Clifford MacEvoy began buying up property and deeds to form the Bergen Country Hunting and Fishing Club. At about this time, a small pond located on the property called "Roten" pond (Dutch for muskrat), was dammed up to form the much larger Ramapo Lake, and some small parcels of land surrounding the lake were sold to private buyers for building lots, one including a television celebrity, lawyer and noted author.