1. Sean trench
  2. Mariana trench
  3. Arabic trench
  4. Cism trench
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Option 2 : Mariana trench

The deepest known depression is the Mariana Trench. It is long, narrow, steep - sided depression in the ocean bottom located in the western Pacific Ocean. It reaches 11,034 metres (36,200 feet) at its deepest point.

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