Champlain Valley southward into the Valley of Vermont. The Vermont Lowlands are primarily underlain by sedimentary rocks, especially limestone and shale, though metamorphic rocks such as marble and slate are also present. Lake Champlain is situated in the Champlain Valley between the Green Mountains of Vermont and the Adirondack Mountains of New York, drained northward by the Richelieu River into the St. Lawrence River at Sorel-Tracy, Quebec (northeast of Montreal). Major tributaries of Lake Champlain include Otter Creek and the Winooski, Missisquoi, and Lamoille rivers in Vermont, and the Ausable, Chazy, Boquet, and Saranac rivers in New York. Lake Champlain also receives
Champlain–St. Bernard de Lacolle Border Crossing Champlain–St. Bernard de Lacolle Border Crossing The Champlain–St. Bernard de Lacolle Border Crossing connects Champlain, New York and St-Bernard-de-Lacolle, Quebec on the United States–Canada border. It is the terminus of Interstate 87 in the US and Quebec Autoroute 15 in Canada. The route is the primary corridor between Montreal—less than 30 miles from the border—and New York City. The crossing is among the busiest in the US; more than two million travelers use it annually, including more than one half million during July and August. and is the second-busiest USA-Canada border crossing that is not located at a bridge. This