A surname from French.

plural of Champlain

A north-south running valley surrounding Lake Champlain, in upstate New York State, Vermont and southern Quebec, spanning the United States and Canada, mostly lying within the U.S.; separating the Adirondacks from the Green Mountains and Appalachians.

A north-south running lake surrounded by the Champlain Valley, in upstate New York, Vermont and southern Quebec, spanning the United States and Canada, mostly lying within the U.S.; separating the Adirondacks from the Green Mountains and Appalachians.

A former sea in northeastern America around the end of the Wisconsin glaciation, covering the current-day Saint Lawrence and Ottawa River valleys.