Puerto Rico Trench

Perspective view of the sea floor of the Atlantic Ocean and the Caribbean Sea. The Lesser Antilles are on the lower left side of the view and Florida is on the upper right. The purple sea floor at the center of the view is the Puerto Rico trench, the deepest part of the Atlantic Ocean and the Caribbean Sea.
Photo from Woods Hole Science Center.

The Puerto Rico Trench is the deepest part of the Atlantic Ocean, and the second deepest part of the Earth's oceans, with a maximum depth of more than 8 km (5 miles), at Milwaukee Deep. The trench marks the location where the North American Plate is being subducted beneath the Caribbean Plate.

The Puerto Rico Trench: Implications for Plate Tectonics and Earthquake and Tsunami Hazards

Puerto Rico Trench

USGS: Mapping of the Puerto Rico Trench

USGS: Earthquake Swarms in the Puerto Rico Trench Monitored by Ocean-Bottom Seismometers

NOAA: Puerto Rico Trench Dive Animation