 and 73° 41 ' Lon.after a course of about 100 kilometers until it is below the ford of Cupaño, at the salto de Gualgalén, where this strong torrent of the river that is about 20 kilometers from its mouth meets the upper reach of the tidal estuary.At the river mouth the coast forms a port or anchorage between the Morro de Tucapel to the south, and the Punta de Millonhue to the north.