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1. Mariana Trench

When it comes to the most deepest points in the ocean then 1st rank goes to the Meriana Trench.

The most deepest point Mariana Trench is located in the Western Pacific Ocean to the east of Mariana Islands.

The trench is about 2,550 kilometres long but has a mean width of only 69 kilometres.The maximum depth of Mariana Trench is about 11 kms (11,003m). It is also known as challenger deep.