 Over 30 inactive volcanic craters are located in Valle de Santiago, but only 7 of those are recognized, and protected as they have been declared national monuments.The seven volcanic craters are known as "Siete Luminares" and include Cíntora, Hoyas de Santa Rosa, La Alberca, San Nicolás de Parangueo, Blanca, Estrada, Álvarez and Solís.Many of these craters naturally evolved into crater-lakes, and they would later become recreational spots.