Every few years in spring depending on rainfall the southern part of Chile's Atacama Desert (the world's driest desert) bursts into flower, a natural phenomenon known locally as El Desierto Florido or El Desierto Floreciendo. Many of the flower and cacti species are endemic to the region and only flower when this event occurs. Llanos de Challe National Park (on the coast to the north of Huasco) is a good area to see this spectacle though it occurs across quite a wide area roughly between Vallenar and Copiapo / Caldera; some years the blooms are more extensive than others.