Sault Ste. Marie is a small city in Michigan's Upper Peninsula on the St. Marys River, which links Lake Superior with Lake Huron and forms the US–Canada border. Settled by French colonists in 1668, it is the oldest city in Michigan; its larger namesake, Sault Ste. Marie, Ontario, lies directly across the river, connected by the International Bridge.
The city is best known for the Soo Locks, the US Army Corps of Engineers locks that lift and lower ships about 21 feet around the river's rapids. You can watch 1,000-foot lake freighters pass from a free public viewing platform.
The compact downtown along Portage Avenue and Water Street has a retired freighter turned museum, historic homes from the fur-trade era, river views and casual restaurants serving local Lake Superior whitefish. It is a regular stop on Great Lakes cruise itineraries.