The Olos River (Swedish: Olosjoki) is a river flowing in the Swedish municipality of Pajala. The river provides the drainage of Lake Olosjävret with an area of approximately 12 hectares. That lake is watered by a few streams from the surrounding area. The Olos River then flows meandering to the south and avoids all the lakes. After 47 kilometers (with longest source river), she flows into the Lainia River.
Drainage: Olos River → Laini River → Torne → Gulf of Bothnia
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