Lake Oulujärvi

Lake Oulujärvi, often referred to as the “Kainuu Sea,” is a prominent lake situated in the Kainuu region of Finland. Known for its expansive size and scenic beauty, it holds a significant place in Finland’s network of lakes.

Geographic and Hydrological Features

Covering a vast area of 928 square kilometers, Lake Oulujärvi ranks as the fifth largest lake in Finland. The lake has an average depth of approximately 7 meters, with its deepest point reaching 38 meters. Encircled by the picturesque municipalities of Vaala, Paltamo, and Kajaani, about 40 percent of the lake’s expanse falls within Vaala’s boundaries. The lake’s coordinates, 64°20′N 027°15′E, place it in a region known for its natural beauty.

Historical Significance

Historically, the lake was also referred to as Lake Cajania, a name derived from an older designation of the Kainuu region. This historical context adds a layer of cultural significance to Lake Oulujärvi, intertwining it with the region’s past.

Main Outflow

The primary outflow of Lake Oulujärvi is the Oulu River, which carries its waters northwestward towards the Gulf of Bothnia. This river plays a vital role in the hydrological system of the region, linking the lake with the broader Baltic Sea basin.

Islands and Natural Beauty

Lake Oulujärvi is adorned with several islands, including Manamansalo, Ärjänsaari, Toukka, Kaarresalo, and Hautakaarre. These islands not only contribute to the lake’s aesthetic appeal but also provide habitats for various wildlife species, enhancing the lake’s biodiversity.

Recreational and Ecological Importance

The lake’s extensive shoreline and natural setting make it a popular destination for recreational activities like boating, fishing, and nature watching. Its ecological significance is underscored by the diverse flora and fauna that inhabit the lake and its surroundings.