The river originates as the outflow of Llanquihue Lake, and flows generally southwestward, over a number of small waterfalls, emptying into the Gulf of Coronados.

The wetlands of Maullín stand out for their diversity of aquatic birds when compared to other locations of the Chilean coast.

[4] In the estuary Laguna Quenuir is the place known to have the largest diversity of bird fauna.

[4] Franciscan Friar Francisco Alvarez Villanueva mention in 1780 Maullín River as the limit between the Spanish possessions and the "Cunco nation" to the north.

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