Multiple choice The deepest point of the Atlantic Ocean is known as the Mariana Trench Sunda Trench Puerto Rico Trench None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation The island of Puerto Rico lies immediately to the south of the fault zone and the trench. The trench is 800 kilometres long and has a maximum depth of 8648 metres (28,373 ft) at Milwaukee Deep, which is the deepest point in the Atlantic Ocean.