Which trench contains Richards Deep, about 8,065 m below sea level?

Richards Deep, about 8,065 m below sea level, lies within the Peru–Chile Trench. Also called the Atacama Trench, it runs along the eastern Pacific margin off Peru and Chile.

The trench formed where the oceanic Nazca Plate is forced beneath the continental South American Plate. This process, called subduction, produces a deep seafloor depression as well as earthquakes and volcanic activity along the Andes and the volcanic zones farther offshore.

The Peru–Chile Trench is roughly 5,900 km long and averages about 64 km wide. Its name can cause confusion because “Atacama Trench” is also widely used, but both names refer to the same feature. The Japan, South Sandwich, and Puerto Rico trenches are separate oceanic trenches in different regions and do not contain Richards Deep.