The Archipiélago de Revillagigedo is part of a submarine mountain range with the four islands representing the peaks of volcanoes emerging above sea level. The Archipiélago de Revillagigedo represents an exceptional convergence of two marine biogeographic regions: the Northeastern Pacific and Eastern Pacific. The islands and surrounding waters of the Archipiélago de Revillagigedo are rich in marine life and recognised as important stepping-stones and stop overs for wide ranging species. The Archipiélago de Revillagigedo is the only place in the world where the critically endangered Townsend’s Shearwater breeds. IntegrityThe Archipiélago de Revillagigedo is remote and largely uninhabited so threats to the property are relatively low.