| Ruunaanjärvi | |
| Pushpin Map: | Finland |
| Coords: | 63.4°N 63°W |
| Type: | Lake |
| Catchment: | Vuoksi |
| Basin Countries: | Finland |
| Area: | 12.428km2 |
| Depth: | 4.14m (13.58feet) |
| Max-Depth: | 22.5m (73.8feet) |
| Volume: | 0.0515km3 |
| Shore: | 44.57km (27.69miles) |
| Elevation: | 139.1m (456.4feet) |
| Frozen: | November–April |
| Islands: | Marjosaari |
| Cities: | Lieksa |
Ruunaanjärvi, or Lake Ruunaa, is a medium-sized lake in the Vuoksi main catchment area in Finland. It is located in the Northern Karelia region and Lieksa municipality.[1] The lake is a part of Ruunaa Hiking Center, which is famous for the possibilities to white water kayaking.[2]