Lake Winnebago, << `wihn` uh BAY goh, >> the largest lake in Wisconsin, covers 215 square miles (557 square kilometers) in the east-central part of the state. It is about 30 miles (48 kilometers) long, and 5 to 10 miles (8 to 16 kilometers) wide. The Fox River enters the lake on the west at Oshkosh, and leaves at the northwest end at Neenah and Menasha. Fond du Lac lies along the southern shore.