Oulujärvi

Oulujärvi (Finnish: [ˈou̯luˌjærʋi]) or Lake Oulu or Ule (Swedish: Ule träsk), is a large lake in the Kainuu region of Finland. It is also historically known as Lake Cajania from a former name of Kainuu.^[3] With an area of 928 square kilometres (358 sq mi) it is the fifth largest lake in the country. The lake is drained by the Oulu River, which flows northwestward from the lake into the Gulf of Bothnia. Its nickname is the "Kainuu Sea", and it is bordered by the three municipalities of Vaala, Paltamo, and Kajaani.^[2] About 40 percent of the lake is in Vaala.

Oulujärvi
Ärjänsaari
Location of Oulujärvi in Finland
Oulujärvi
Location	Kainuu, Finland
Coordinates	64°20′N 027°15′E / 64.333°N 27.250°E / 64.333; 27.250
Primary outflows	Oulu River
Basin countries	Finland
Surface area	928.09 km2 (358.34 sq mi)[1]
Average depth	ca. 7 m (23 ft)[2]
Max. depth	38 m (125 ft)
Shore length1	1,201.17 km (746.37 mi)
Surface elevation	120.9–123.6 m (397–406 ft)[1]
Islands	Manamansalo, Ärjänsaari, Toukka, Kaarresalo, Hautakaarre
Settlements	Kajaani, Paltamo, Vaala
References	[1][2]
1 Shore length is not a well-defined measure.