Tonga Trench

a deepwater trench in the Pacific Ocean. It extends for 1,600 km along the eastern edge of the submarine Tonga Range, from the islands of Samoa to the Kermadec Islands. The Tonga Trench is about 80 km wide along the 6,000 m isobath, and its maximum depth is 10,882 m; this is the deepest point in the oceans of the southern hemisphere.