Marianas

Example:While the Mariana Trench is the deepest part of the ocean, an abyss can also be used to describe any extremely deep and dark place.

Definition:A very deep hole or hollow, often referring to the bottom of the ocean or a deep valley.

Example:In contrast to the deep Mariana Trench, shallow reefs are found in nearby islands.

Definition:Not deep or not going down very far, often used in contrast to deep places like some trenches or valleys.