elongated finger lake that crosses the United States–Canadian border 5 miles (8 km) north of Newport, Vt., U.S. Extending about 27 miles (43 km) from Newport to Magog, Que., the lake forms a small part of the northern boundary of Vermont. It is only 1–2 miles (1.5–3 km) wide for most of its length but has several large embayments; these include Fitch Bay on the eastern shore and Sargents Bay on the west. Depths average 50–75 feet (15–23 m) with shallows at the southern end. A small-scale hydroelectric development has been established at the northern end of the lake where it drains by way of the Magog and St.-François rivers into the St. Lawrence. The lake is surrounded by hills and mountains, the loftiest being Owl's Head (3,360 feet 【1,024 m】), on the western shore. The name Memphremagog comes from the Algonquian, meaning “where there is a big expanse of water.”