Thief Lake collects the Moose River, and the Thief River collects the Mud River in the Agassiz Refuge.
Name
Thief River Falls takes its name from a geographic feature, the falls of the Red Lake River at its confluence with the Thief River. The name of the river is a loose translation of the Ojibwe phrase, Gimood-akiwi ziibi, literally, the "Stolen-land river" or "Thieving Land river," which originated when a band of Dakota Indians occupied a secret encampment along the river, hence "stealing" the land, before being discovered and routed by the neighboring Ojibwe.[2]
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