The Valdivia river ends in Corral Bay, on the Pacific coast.

Its estuary has maximum depths that range from 7 to 22 m and hosts a saline wedge.

[3] During times of low discharge saline bottoms waters penetrate upstream all the way to its tributary Calle-Calle River.

[4][5] The foraminiferal fauna of the wetlands adjoining the river is dominated by Trochamminita salsa.

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