It empties into the Teno River near the city of Los Queñes.

In February 1991, eruptions from the volcanic complex of Planchón-Peteroa (Planchón (3977 m) and Peteroa (4101 m)) 35 km southeast Los Queñes contaminated the water and killed large numbers of fish.

It was the former training site of the U.S. Olympic slalom kayak team.

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