He founded a fort at Santa Cruz de Oñez in May 1594, near the confluence of the Bio-Bio and Laja Rivers in Catiray, where gold mines were located on the Rele River.
It has its origin to the south southeast of Santa Juana, from where it runs to the northeast from among the slopes of the heights of the Nahuelbuta Range and runs to the east to the Bio Bio River in which it empties a little above the confluence with the Laja River.
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