Arauco is a city and commune in Chile, located in Arauco Province in the Bío Bío Region. The meaning of Arauco means Chalky Water in Map…Arauco is a city and commune in Chile, located in Arauco Province in the Bío Bío Region. The meaning of Arauco means Chalky Water in Mapudungun. The region was a Moluche aillarehue. The Spanish settlements founded here during the Conquest of Chile were destroyed on numerous occasions by the Mapuche during the Arauco War.
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