| Caopatina Lake | |
|---|---|
 Watershed of Nottaway River | |
  Caopatina Lake | |
| Location | Eeyou Istchee James Bay (municipality) |
| Coordinates | 49°26′52″N 74°45′54″W / 49.44778°N 74.76500°W |
| Type | Natural |
| Primary inflows | Opawica River, Roy River (Opawica River), the outlet of a set of lakes |
| Primary outflows | Opawica River |
| Basin countries | Canada |
| Max. length | 16.7 kilometres (10.4 mi) |
| Surface area | 46 kilometres (29 mi) |
| Surface elevation | 365 metres (1,198 ft) |
Caopatina Lake is a freshwater body of the southeastern portion of Eeyou Istchee James Bay (Municipality), in Jamésie, in the administrative region of Nord-du-Québec, in the province of Quebec, in Canada.
Forestry is the main economic activity of the sector. Recreational tourism activities come second.
The hydrographic slope of Lake Caopatina is accessible through the forest road R1032 (North-South direction). The surface of Caopatina Lake is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.