What is the name of the depression in the ocean floor located south and west of the Mariana Islands?

The depression located south and west of the Mariana Islands is known as the Marianas Trench. This trench is the deepest part of the world's oceans and reaches a maximum known depth of about 36,000 feet (approximately 10,973 meters). Its formation is primarily due to tectonic plate movement, where the Pacific Plate is being subducted under the smaller Mariana Plate.

The Marianas Trench represents a significant geological feature, playing a vital role in oceanic processes and contributing to our understanding of marine geology and biology. Studying this trench helps scientists learn more about the extreme conditions of the deep-sea environment and the unique organisms that inhabit it. Other terms, such as "Crustacean," "Titanium," and "The Hellenic trough," pertain to different subjects and contexts that do not refer to this specific oceanic trench.