Marias (mərĪˈəz) [key], river, c.210 mi (340 km) long, rising in
several branches in NW Montana near the Continental Divide and
flowing SE to the Missouri River near Fort Benton. It receives
the Teton River. The Marias is used for irrigation. Tiber Dam
(completed 1956), located in the lower course, is part of the
Missouri River basin project. The Columbia Electronic
Encyclopedia, 6th ed. Copyright © 2012, Columbia University
Press. All rights reserved. More on Marias from Fact Monster:
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