The only presently active ridge-trench collision where the overriding plate is composed of continental lithosphere. Three tectonic plates meet here at the southern coast of Chile (46.5°S, 75.5°W): the South American Plate, the Nazca Plate, and the Antarctic Plate. The Chile Margin Triple Junction is the only known location on Earth that can co-host every known form of deep-sea chemosynthetic ecosystem: hydrothermal vents, cold seeps, and oxygen minimum zones; also called "Chile Triple Junction (CTJ)".