<P> The Challenger Deep is the deepest known point in the Earth's seabed hydrosphere, with a depth of 10,898 to 10,916 m (35,755 to 35,814 ft) by direct measurement from submersibles, and slightly more by sonar bathymetry . It is in the Pacific Ocean, at the southern end of the Mariana Trench near the Mariana Islands group . The Challenger Deep is a relatively small slot - shaped depression in the bottom of a considerably larger crescent - shaped oceanic trench, which itself is an unusually deep feature in the ocean floor . Its bottom is about 11 km (7 mi) long and 1.6 km (1 mi) wide, with gently sloping sides . The closest land to the Challenger Deep is Fais Island (one of the outer islands of Yap), 287 km (178 mi) southwest, and Guam, 304 km (189 mi) to the northeast . It is located in the ocean territory of the Federated States of Micronesia, 1.6 km (1 mi) from its border with ocean territory associated with Guam . </P> <P> The depression is named after the British Royal Navy survey ship HMS Challenger, whose expedition of 1872--1876 made the first recordings of its depth . According to the August 2011 version of the GEBCO Gazetteer of Undersea Feature Names, the location and depth of the Challenger Deep are 11 ° 22.4 ′ N 142 ° 35.5 ′ E ﻿ / ﻿ 11.3733 ° N 142.5917 ° E ﻿ / 11.3733; 142.5917 and 10,920 m (35,827 ft) ± 10 m (33 ft). </P>

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