Ourthe (ōrt) [key], river, c.100 mi (160 km) long, rising in the Ardennes Mts., E Belgium, and flowing generally north to join the Meuse River at Liège. Its valley provides one of the few passages between the Meuse valley and the S Ardennes.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
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