It was on a small height on the edge of the Bay of Arauco, a little more than two kilometers to the southeast of the modern city of Lota.
This place was established as a small fort at the start of the conquest, and was several times destroyed by the Moluches and repaired.
Following the Mapuche Uprising of 1598 it was rebuilt again in 1602 by governor Alonso de Ribera.
After the Mapuche Insurrection of 1655, Pedro Porter Casanate built a new fortress of San Miguel Arcángel de Colcura on the same site in 1662.
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