The Revillagigedo Islands (, ) or Revillagigedo Archipelago are a group of four volcanic islands in the Pacific Ocean, known for their unique ecosystem. They have been part of Manzanillo municipality of the Mexican state of Colima since 1861, but are nevertheless under Mexican federal jurisdiction, and lie 386?km (240 mi) southwest of Cabo San Lucas, the southern tip of the Baja California peninsula, and between 720 and 970?km (447 and 603 mi) west of Manzanillo.