Monponsett Pond, also called Monponsett Lake and the Twin Lakes, is actually a system of two ponds, West and East, mostly in Halifax, Massachusetts, with a small portion of West Monponsett Pond extending into Hanson. The western basin is 282 acres (1.14 km²), and the eastern basin is 246 acres (1.00 km²). The average depth of both ponds is seven feet and the maximum depth is 13 feet (4.0 m). The outflow is Stump Brook, a tributary of Poor Meadow Brook, in the northwestern part of West Monponsett Pond. The pond is part of the Taunton River Watershed.