Oulujoki (Swedish: Ule älv) is a river in North Ostrobothnia, Finland. Its name in Finnish literally means "Oulu River", originally in old Northern Ostrobothnian dialect literally "Flood River".^{[citation needed]} Its origin is Oulujärvi, and its watershed area covers a significant part of Kainuu region. It flows into the Bothnian Bay at Oulu. Port of Oulu is located at the mouth of the river.