Mascoma Lake is a 1,158-acre (469 ha) lake in western New Hampshire, United States. Most of the lake is within the town of Enfield, while a small portion is within the city of Lebanon, where it drains into the Mascoma River, a tributary of the Connecticut River. The lake freezes during winter and is stable enough to be walked upon. Ice fishing is popular on the lake. The lake is stocked with trout by the New Hampshire Fish and Game Department. NASA and its partners have used the frozen lake to test a robotic rover as a simulation of Antarctica.