The Green Mountains are the most prominent topographic region in Vermont. Extending north–south from the Canadian border to the Massachusetts state line, the Green Mountains contain the state's highest peaks, including Mansfield, 4,393 ft (1,340 m), the highest point in Vermont; Killington, 4,235 ft (1,293 m); and Elbow Mountain (Warren), 4,135 ft (1,260 m). A much lower range, the Taconic Mountains, straddles the New York-Vermont border for about 80 mi (129 km). To their north is the narrow Valley of Vermont; farther north is the Champlain Valley, a lowland about 20 mi (32 km) wide between Lake Champlain—site of the state's lowest point, 95 ft (29 m) above sea level—and the Green Mountains. The Vermont piedmont is a narrow corridor of hills and valleys stretching about 100 mi (161 km) to the east of the Green Mountains. The Northeast Highlands consist of an isolated series of peaks near the New Hampshire border.
Vermont's major inland rivers are the Missisquoi, Lamoille, and Winooski. The state includes about 66% of Lake Champlain on its western border and about 25% of Lake Memphremagog on the northern border.