Saar (zär) [key], Fr. Sarre, river, c.150 mi (240 km) long, rising in the Vosges Mts., NE France, and flowing N past Sarrebourg and Sarreguemines. It enters Saarland, W Germany, and continues NW past Saarbrücken into the Moselle River near Trier. The river flows through a heavily industrialized region; it carries much barge traffic.
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