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Mt. Lamlam, GUAM - Mt. Lamlam in Southern Guam (Highest mountain on Earth below sea level atop the Mariana Trench). Mt. Lamlam in Guam is 37,828 ft below sea level. Mauna Kea in Hawaii is 33,838 ft from below sea level; Mt. Everest is 29,029 ft from below sea level. Guam sits atop the Mariana Trench, situated between the Philippine Tectonic Plate, which subducts the Pacific Tectonic Plate (Earth's old crust). The Challenger Deep (deepest part of the Mariana Trench has been measured using sonar 3x, (by 3 different scientific expeditions), showing depth ranging between 10,902m-10,916m, making it the undisputed deepest part of the ocean on Earth. These facts gives Mt. Lamlam the distinction of being the highest mountain on Earth below sea level.