Caucau River is minor river in the city of Valdivia, southern Chile.

Caucau River acts as a regulating channel between Cruces River and Calle-Calle River forming the Isla Teja island in front of the city centre.

'[3] The subsidence caused by the 1960 Valdivia earthquake caused a permanent flooding of parts botanical garden of the Austral University of Chile that were next to Caucau River.

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