History
Before the Spanish, the valley was farmed by peoples the Inca called Promaucaes, and the Inca's reach ended roughly at the Maule river. South of it lay Mapuche country. Pedro de Valdivia founded Concepción in 1550, but in 1553 Mapuche forces under Lautaro killed him at Tucapel, and the Biobío river became the frontier — La Frontera — lined with Spanish forts for nearly three centuries. Concepción, first built at Penco, was destroyed several times by earthquakes and moved to its present site in the 18th century.
North of the river, the colonial valley became a country of great haciendas worked by tenant labourers, the inquilinos, the society that produced the huaso. The independence wars were fought across it: Bernardo O'Higgins was born in Chillán in 1778, patriot forces were defeated at Rancagua in 1814, and the regions around Talca and Concepción changed hands repeatedly before 1818.
In the 19th century coal mining at Lota and Coronel made the Biobío coast an industrial zone, while railways and later irrigation turned the valley into Chile's orchard. Earthquakes have shaped the modern region: the 1939 Chillán earthquake was one of the deadliest in Chilean history, and the magnitude 8.8 earthquake of February 2010, centred off Maule, and its tsunami devastated Constitución, Talcahuano and the coast. Ñuble was separated from Biobío as a region of its own in 2018.
