Lake Attitash is a 373-acre enlarged great pond located about a mile and a half-mile northeast of Merrimac Center. The maximum depth is 34 feet; the average depth is 10 feet. The bottom is predominantly sand and gravel, and aquatic vegetation is scant except in the inlet and outlet coves. The shoreline is nearly completely developed with homes.

Public access is provided by a paved ramp on the pond’s southern shore. Parking is available for 22 cars and trailers.