Location of the Mariana Trench

The Mariana Trench is the deepest oceanic trench on Earth, located in the western Pacific Ocean.

Coordinates & Geography

• Position: ~11°21′N, 142°12′E — ~200 km (124 mi) east of the Mariana Islands (Guam, Saipan, Tinian, Rota).
• Orientation: Arcuate, ~2,550 km long, ~69 km wide — follows the Mariana subduction zone (Pacific Plate subducting under Philippine Sea Plate).
• Deepest point: Challenger Deep — 10,935 m (35,876 ft) below sea level (2021 multibeam survey).

Context

• Territory: Within EEZ of Federated States of Micronesia (east) and US (Guam/CNMI — west).
• Protection: Marianas Trench Marine National Monument (2009, US) — 246,000 km² including trench, volcanoes, islands.
• Exploration: 1960 Trieste (Piccard/Walsh), 2012 Deepsea Challenger (Cameron), 2019 Limiting Factor (Vescovo — multiple dives), robotic landers (KAIST, WHOI).

Why It's Deep

Old, cold, dense Pacific Plate subducts steeply; no sediment fill (far from continents); tectonic erosion deepens the trench axis.

It is the ultimate hadal environment — pressure 1,100 atm, near-freezing, pitch dark, yet teeming with specialized life (amphipods, holothurians, microbial mats).