Middle Sister Island
| Geography | |
|---|---|
| Location | Lake Erie |
| Coordinates | 41°50′55″N 83°00′03″W / 41.8487°N 83.0007°W |
| Archipelago | Sister Islands |
| Major islands | East Sister Island and West Sister Island |
| Area | 9.5 acres (3.8 ha) |
| Highest elevation | 571 ft (174 m) |
| Administration | |
Canada | |
| Province | Ontario |
| County | Essex |
| Township | Pelee |
Middle Sister Island is a 9.5-acre (3.8 ha) island in Lake Erie. Along with West Sister Island (in Ohio, USA) and East Sister Island, it is part of the Pelee Archipelago in the western basin of Lake Erie, and is considered to be the "most natural and undisturbed" of these islands.