Antuco is a Chilean commune and town in Bío Bío Province, Bío Bío Region. The commune includes Laguna del Laja and Laguna del Lajā¦Antuco is a Chilean commune and town in Bío Bío Province, Bío Bío Region. The commune includes Laguna del Laja and Laguna del Laja National Park, which contains Antuco Volcano and Sierra Velluda. The latter is the tallest mountain in Bío Bío Region. The town of Antuco is located slightly south of the south bank of the Laja River.