Which river is the longest in Michigan?

The Grand River is recognized as the longest river in Michigan, measuring approximately 252 miles. It flows through several major cities, including Grand Rapids and Lansing, and eventually empties into Lake Michigan. The river has significant historical importance and serves numerous recreational purposes, such as boating and fishing, contributing to its prominence in the state.

The other rivers listed, while notable, do not match the length of the Grand River. The Tittabawassee River is about 135 miles long and is known primarily for its role in the Saginaw Valley. The term "Michigan River" does not denote a specific river recognized in Michigan's geography, while the Pere Marquette River, which is about 66 miles long, is well-known for its scenic beauty and fishing opportunities. However, in terms of length, none surpass the Grand River.