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
Ticonderoga (CDP), New York the Vermont border. The community lies between Lake George and Lake Champlain on the site of a portage between the two lakes, previously guarded by historic Fort Ticonderoga. The waterway running through this portage is called the La Chute River, which drains the outflow of Lake George into Lake Champlain, and it contains a waterfall at the eastern edge of the hamlet. During the summer, a diesel-powered cable ferry connects the community to Shoreham, Vermont. The junction of New York State Route 9N, New York State Route 74, and New York State Route 22 is at the northern edge of