The deepest known point in the oceans. It is in the Pacific Ocean, off the island of Guam in the Mariana Islands group at the southern end of the Mariana Trench, it is 35,838 feet (10,920 metres) deep at its maximum.
The Challenger Deep got its named after the survey ship Challenger II, which was surveying the trench in 1951. In 1960, the US Navy Bathyscaphe Trieste descended to 35,813 feet deep in the trench.