Province Lake is a 967-acre (3.9 km²) water body located on the border between New Hampshire and Maine in the United States. Approximately 950 acres (3.8 km²) of the lake lie in the towns of Effingham and Wakefield, New Hampshire, with the remainder in Parsonsfield, Maine. Its outlet is the South River, flowing north to the Ossipee River, a tributary of the Saco River.
Province Lake's maximum depth is between 15 to 17 feet (5 m), quite shallow for a New Hampshire lake, so there are no coldwater fish within. It is fed by several wetland areas, one named stream (Hobbs Brook), and by underwater springs. The quality of the water is high.
Small and largemouth bass, yellow perch, pickerel, horned pout and sunfish draw fishermen. Loons, an eagle, great blue heron, and occasional mergansers are seen at the lake.