The Puerto Rico Trench is about 1,090 miles (1,750 km) long and 60 miles (100 km) wide. The deepest point in the Atlantic Ocean, the Milwaukee Depth, lies within the Puerto Rico Trench, at a depth of 27,493 feet (8,380 meters) in the western end of the trench, about 100 miles (160 km) northwest of Puerto Rico. The origin of the trench can be ...