Marquette is the county seat of Marquette County and the largest city in the Upper Peninsula of the U.S. state of Michigan. Located on the shores of Lake Superior, Marquette is known for Marquette Iron Range and is the home of Northern Michigan University (NMU), a four-year public university. The largest employers in Marquette are the Marquette Area Public Schools, UP Health System-Marquette (the only Level 2 Trauma center in the Upper Peninsula), Marquette Branch Prison, RTI Surgical, Charter Communications, and Blue Cross Blue Shield of Michigan. Marquette is known for its five breweries, including most notably Ore Dock Brewing Company and Blackrocks Brewery.