Lake Mjosa

Mjøsa
View northwards from Minnesund, Eidsvoll
Location	Akershus, Hedmark, Oppland
Coordinates	60°40′N 11°00′E / 60.667°N 11.000°E / 60.667; 11.000Coordinates: 60°40′N 11°00′E / 60.667°N 11.000°E / 60.667; 11.000
Primary inflows	Gudbrandsdalslågen
Primary outflows	Vorma
Basin countries	Norway
Max. length	117 km (73 mi)
Max. width	15 km (9.3 mi)
Surface area	362 km2 (140 sq mi)
Average depth	155 m (509 ft)
Max. depth	449 m (1,473 ft) (other sources give 468 m)
Water volume	56.0 km3 (45,400,000 acre·ft)
Surface elevation	121 m (397 ft) (other sources give 123 m)
Islands	Helgøya
Settlements	Hamar, Gjøvik, Lillehammer
References

Mjøsa is Norway's largest lake, as well as one of the deepest lakes in Norway and in Europe. It is the fourth-deepest lake in Norway. It is located in the southern part of Norway, about 100 km north of Oslo. Its main tributary is Gudbrandsdalslågen in the north; the only distributary is Vorma in the south.

From its southernmost point at Minnesund in Eidsvoll to its northernmost point in Lillehammer it is 117 km long. At its widest, near Hamar, it is 15 km wide. It is 365 km² in area and its volume is estimated at 56 km³; normally its surface is 123 metres above sea level, and its greatest depth is 468 metres. Its total coastline is estimated at 273 km, of which 30% is built up. Dams built on the distribuary of Vorma in 1858, 1911, 1947, and 1965 raised the level by approximately 3.6 metres in total. In the last 200 years, 20 floods have been registered that added 7 metres to the level of Mjøsa. Several of these floods inundated the city of Hamar.

The cities of Hamar, Gjøvik, and Lillehammer were founded along the shores of the lake. Before the construction of railways past the lake, it was an important transport route. Today, aside from minor leisure boating and the steamship Skibladner, there is no water traffic on the lake. Most of its shores are dominated by rolling agricultural areas, among them some of the most fertile grainlands in Norway. The main train line, the Dovre Line between Oslo and Trondheim, goes along its eastern shore, making stops in Hamar and Lillehammer. The largest, and only, island is Helgøya. Except for Helgøya, Mjøsa only contains small islets. The most interesting of these are Steinsholmen, with the ruins of a Middle Age citadel.