| Caption Map: | Interactive map of the lake |
| Coordinates: | 68.6424°N 19.0859°W |
| Location: | Troms |
| Type: | glacier lake |
| Inflow: | Fiskløyselva, Gamasjohka, Geadgejohka, Jordbruelva, Koievasselva, Krokelva, Leinavasselva, Luotnajohka and Suttesgaldojohka |
| Outflow: | Barduelva |
| Catchment: | 1249km2 |
| Basin Countries: | Norway |
| Length: | 45km (28miles) |
| Width: | 3km (02miles) |
| Area: | 79.65km2 |
| Depth: | 28m (92feet) |
| Max-Depth: | 111m (364feet) |
| Volume: | 2.23km3 |
| Elevation: | NaNm (-2,147,483,648feet) |
| Reference: | NVE[1] |
or [2] is Norway’s 11th largest lake. The 79.65km2 lake lies in Bardu Municipality in Troms county, Norway.
Altevatnet is the largest lake in the county. It is approximately long and about wide. The lake is regulated by a dam on the northwestern end of the lake. The surface lies above sea level and reaches a maximum depth of below the surface of the lake.[3]
The lake lies about from the Norwegian border with Sweden and it is located right between the two national parks: Øvre Dividal National Park and Rohkunborri National Park. The water discharges to the north into the Barduelva river, which empties into Målselva river, which in turn empties into the Malangen fjord.[4]