Oulujärvi

Oulujärvi () or Lake Oulu or Ule (), is a large lake in the Kainuu region of Finland. It is also historically known as Lake Cajania from a former name of Kainuu. With an area of 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. About 40 percent of the lake is in Vaala.

Manamansalo is the largest island in the Oulujärvi, the fifth largest lake in Finland. Administratively it belongs to the Vaala municipality in North Ostrobothnia, or Kainuu until 2016. It is the seventh largest inland island in Finland, or the fifth largest if Soisalo and Sääminginsalo are not counted as islands.

thumb|right|300px|Tevä island, with Mulkkusaaret islands in the top right Mulkkusaaret (literally translates to Dick Islands or Penis Islands) is a group of three small islands and one rock in lake Oulujärvi in the Paltamo municipality in Finland. The islands are located north of Tevä island, approximately south-southwest from Melalahti village and approximately north-northwest from Paltaniemi village.

cable ferry in Vaala, Finland