Lake Champlain level. Lake Champlain is in the Lake Champlain Valley between the Green Mountains of Vermont and the Adirondack Mountains of New York, drained northward by the -long Richelieu River into the St. Lawrence River at Sorel-Tracy, Quebec, northeast and downstream of Montreal, Quebec. It also receives the waters from the -long Lake George, so its basin collects waters from the northwestern slopes of the Green Mountains and the northernmost eastern peaks of the Adirondack Mountains. Lake Champlain drains nearly half of Vermont, and approximately 250,000 people get their drinking water from the lake. The lake is fed in Vermont by
Lake Champlain Vermont are on the lake's western and eastern shores, respectively, and the village of Ticonderoga, New York is in the region's southern part. The Quebec portion is in the regional county municipalities of Le Haut-Richelieu and Brome-Missisquoi. There are a number of islands in the lake; the largest include Grand Isle, Isle La Motte, and North Hero, all part of Grand Isle County, Vermont. The Champlain Valley is the northernmost unit of a landform system known as the Great Appalachian Valley, which stretches between Quebec, Canada, to the north, and Alabama, US, to the south. The Champlain Valley is a