Rancagua is a city and commune in central Chile and part of the Rancagua conurbation. It is the capital of the Cachapoal Province and of the O'Higgins Region, located 87 km (54 mi) south of the national capital of Santiago.Its first name was Santa Cruz de Triana. In 2002, its population was 214,344. The main economic activities range from mining, tourism, agriculture, timber, food production and services to minor industrial activities. The city also serves as the administrative and legal center of the region.