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Tamu Massif

Seamount
Tamu Massif is a seamount in the northwest Pacific Ocean, sitting atop a triple junction of mid-ocean ridges. Tamu Massif is located in the Shatsky Rise about 1,600 km east of Japan. The massif covers an area of about 553,000 square kilometres. Wikipedia
Elevation: 14,436′
Coordinates: 33°N 158°E / 33°N 158°E
Size: about 120,000 square miles
Age of rock: 144.6 ± 0.8 Ma