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The Izu–Ogasawara Trench , also known as Izu–Bonin Trench, is an oceanic trench in the western Pacific Ocean, consisting of the Izu Trench and the Bonin Trench.
It stretches from Japan to the northernmost section of Mariana Trench. The Izu–Ogasawara Trench is an extension of the Japan Trench. Here, the Pacific Plate is being subducted beneath the Philippine Sea Plate, creating the Izu Islands and Bonin Islands on the Izu–Bonin–Mariana Arc system.
It is 9,780 metres at its deepest.
The xenophyophore Occultammina was first discovered at a depth of 8260 metres in the trench.
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