マリアナ海かい溝こう

noun

Mariana Trench

Refers to the deepest oceanic trench on Earth, located in the western Pacific Ocean near the Mariana Islands.

• マリアナ海かい溝こうの最さい深しん部ぶはチャレンジャー海かい淵えんと呼よばれている。

  The deepest part of the Mariana Trench is called the Challenger Deep.