Nacimiento is a Chilean city situated in the Bío Bío Province, Bío Bío Region, 550 km south of Santiago, and 104 km from the closest majo…Nacimiento is a Chilean city situated in the Bío Bío Province, Bío Bío Region, 550 km south of Santiago, and 104 km from the closest major city in the region, Concepción. It was first used as a fort for the Spanish army to advance and control the territory, and it was officially baptised on Christmas Eve of December 1603 with the name of Nacimiento de Nuestro Señor. Destroyed in the later risings of the Mapuche and repaired in 1665, 1724 and for the last time in 1739, it was transferred with its inhabitants in 1749 to the site of the current town.