The river drains much of the swampy Isthmus of Ofqui and originates near Presidente Ríos Lake.
Indigenous canoe-faring Chonos used the rivers as part of a north–south route that traversed the Taitao Peninsula and Isthmus of Ofqui.
[1] This route was unknown to the colonial Spanish who used San Tadeo River for the same purpose.
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