Iijoki basin

Iijoki () is a river of Finland in the region of North Ostrobothnia. The river has many tributaries. It flows for into the Gulf of Bothnia. Some of its main tributaries are Siuruanjoki and Livojoki. It has about 150 rapids.

Ranuanjärvi is a small and shallow lake of Finland located in the center of municipality of Ranua, in the region of Lapland. It belongs to Iijoki main catchment area.