 Aerial view of Harsens Island (center) | |
  Harsens Island | |
| Geography | |
|---|---|
| Location | Mouth of the St. Clair River at Lake St. Clair |
| Coordinates | 42°35′24″N 82°33′05″W / 42.59000°N 82.55139°W |
| Administration | |
| State | Michigan |
| County | St. Clair County |
| Township | Clay Township |
Harsens Island is a marshy island at the mouth of the St. Clair River on Lake St. Clair, in the U.S. state of Michigan. Politically, the island is in Clay Township of St. Clair County.