The Lyman Reserve is a 210-acre (0.85 km²) nature reserve in Bourne, Plymouth and Wareham, Massachusetts and is managed by the Trustees of Reservations. There are 1.5 miles (2.4 km) of hiking trails, a beach and is in proximity to the Red Brook Reserve and Red Brook Wildlife Management Area. The area was formerly as private fishing camp, which sits at the mouth of Red Brook at Buttermilk Bay.