Munising is a city in the Upper Peninsula of the U.S. state of Michigan. The population was 1,986 at the 2020 census, thus making it the 17th largest in the Upper Peninsula. It is the county seat of Alger County. The city is partially surrounded by Munising Township, but the two are administered autonomously. Located on the southern shore of Lake Superior in the Upper Peninsula, it serves as the western gateway to Pictured Rocks National Lakeshore.