It has two tributaries the Culenco River flowing southeast from the Nahuelbuta Range in the Catirai region and the Nicodahue River that flows north from the La Araucanía Region and its two tributaries the Esperanza and Maitenrehue Rivers that all originate northwest of Angol.
Immediately downstream from its mouth was the location of the old fort of Espirito Santo and on its banks significant placer gold deposits.
Its Mapudungun name meant confluence (from thavun, to join itself, and from leuvu, river).
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