Iceland has over 20 lakes larger than 10 km2 (4 sq mi), and at least 40 others varying between 2.5 and 10 km2 (1 to 4 sq mi) in size. This list also includes a few smaller lakes and ponds that are considered notable (for example Tjörnin in Reykjavik). The figures for many of the smaller lakes are unreliable. Also, some larger lakes vary considerably in size between years or seasons or, for the reservoirs, according to the needs of power plants. Some power plant reservoirs may not be present despite being larger than listed lakes.
Reservoir for the Kárahnjúkar Hydropower Plant. [1][2] The maximum depth of 180 m is reached in late summer when the reservoir fills up and excess water starts to flow over through the spillway. In winter, the surface elevation, and thus the maximum depth, of the lake drops by approximately 45 m. In a very dry year a further drop of 20 m is expected, meaning that the depth of the lake at its deepest point can vary between 115 m and 180 m.[1]
Hydroelectric reservoir, largest lake in E Iceland and the largest longitudinal lake in Iceland in a valley probably arising from a geological fault; fed by meltwater from Vatnajökull
A lake that forms in the caldera of the subglacial volcano of the same name. On one theory, the meaning of the name is "Odin’s lake", although several other explanations are possible, given that Grímur is a common man's name in Iceland.[3]
