This iis a trench.Also ocean basin is the deepest part of the ocean.
Abyssal plain. These are flat areas in the deep ocean basin that are covered in sediment and are generally found at depths below 4,000 meters.
A v-shaped valley below the ocean is known as a submarine canyon, formed through a combination of erosion from currents, sediments, and tectonic activity.
The mid-ocean ridge is the mountain ridge that runs along the bottom of the ocean and is formed by plate tectonics.
an ocean valley is a valley that contains water
Undersea mountain range with a steep, narrow valley along its center.
That would be a mid-ocean ridge, which is an underwater mountain range that forms at divergent plate boundaries. The steep narrow valley along the center is called a rift valley, where new oceanic crust is formed as tectonic plates pull apart.
turbulence
because
Because the water may collect at the bottom of the basin, or evaporate.
the coast or it could be the cental valley
Submarine mountain ranges at the bottom of the ocean are called oceanic ridges or mid-ocean ridges. These are underwater mountain ranges that form along plate boundaries where tectonic plates are diverging or moving apart.
Atlantic Ocean