Located in northeastern Wisconsin, the Oconto River is a tributary of Lake Michigan via Green Bay. The Oconto River is long, stretching from the confluence of its North and South branches at Suring, Wisconsin, to Green Bay at the city of Oconto. Its drainage basin covers , encompassing most of Oconto County as well as portions of Shawano, Marinette, Menominee, Langlade, and Forest counties. Images References Tributaries of Lake Michigan Rivers of Wisconsin Rivers of Oconto County, Wisconsin Rivers of Shawano County, Wisconsin Rivers of Marinette County, Wisconsin Rivers of Menominee County, Wisconsin Rivers of Langlade County, Wisconsin Rivers of Forest County, Wisconsin