Østerå River ("East Stream"; also Kjærs Mølleå) is a Danish waterway located in the northern reaches of tunnel valley between Viborg and Aalborg.
Its original outlet was at the center of Aalborg where it functioned as a harbor, providing a water supply and power source.
Østerå served as a harbour for light ships until the second half of the 19th century.
[1] Though the river was piped in the late 1800s to bypass the city center, its original course is noted in place names such as Østerå, Aagade and Mølleplads.
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