Lake Butte des Morts

Big Lake Butte des Morts () is a shallow freshwater lake located in the U.S. state of Wisconsin, in Winnebago County. It is part of the Winnebago Pool of lakes in east central Wisconsin, along with Lake Winnebago, Lake Poygan, and Lake Winneconne. The lake is fed by the Fox River in the southwest and the Wolf River draining from Lake Winneconne in the northwest, and drains via the Fox River southeast into Lake Winnebago. The lake is part of the Butte des Morts region in Winnebago County, Wisconsin. This lake is not connected to Little Lake Butte des Morts, which is located to the north, downstream of Lake Winnebago, fed by the lower Fox River.

The name "Butte des Morts" was given by French colonial settlers. It means "Mound of the Dead", in reference to a nearby prehistoric Native American burial mound. In the Menominee language this place is known as Paehkuahkīhsaeh which means "small mound".