Lake Winnebago is a large lake in eastern Wisconsin. It is about 30 by 10 miles (50 by 16 km), and has a surface area of about 137,700 acres (557 km²), making it the largest lake completely within Wisconsin. It is a popular sport fishing lake; many fisherman consider it one of the nation's top walleye fisheries, and it also has a population of sturgeon. Cities on its shores include Oshkosh, Fond du Lac, and Neenah. It is drained by the Fox River.