St. Clair River
Lake St. Clair connects Lake Huron and Lake Erie through the St. Clair River in the north and the Detroit River in the south. At , it is one of the largest non-Great Lakes in the United States, but it only contains a small number of islands near the mouth of the St. Clair River, where all of the following islands are located. The largest of these islands is Harsens Island, and all the islands are in Clay Township in St. Clair County.