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
Champlain, New York connecting New York City to the south with Montreal to the north, via Quebec Autoroute 15. Champlain is approximately south of Montreal. According to the 2010 2010 United States census, the town has a total area of , of which is land and , or 12.90%, is water. Lake Champlain and the Richelieu River are on the east edge of the town, which shares a border with Grand Isle County, Vermont. The town line to the north is the international border with Saint-Bernard-de-Lacolle, Quebec, Canada. The Adirondack Northway (Interstate 87) is a major north-south highway that begins at the Canada–United