Lake Mattawa is a 118 acre Great Pond located in the town of Orange just south of MA-2. The presence of numerous underwater springs contributes to clear water that is typically transparent to 15 feet or more. The bottom is predominately gravel and sand and aquatic vegetation is rare and largely limited to shallow coves. The shoreline is 75% developed with year-round homes and summer cottages. Recreational usage in the summer is high, with swimming, fishing, and sailing the most popular activities.

Two paved public ramps, both of which are on Lake Mattawa Road, provide boat access areas. Shoreline access is along Holtshire Road and by the boat access areas. Recreational usage in the summer is high, with swimming, fishing, and sailing the most popular activities.

The town beach in the south is for residents of Orange only. There is a sign indicating no launching of canoes.