sea mountain
That would be the Mid-Atlantic Ridge.
A submarine mountain range is an underwater range of mountains that may be formed by plate tectonics or volcanic activity. These ranges are often found along the ocean floor and can extend for hundreds or thousands of kilometers. They can create a diverse range of habitats for marine life.
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Every submarine since Drebbel's first in 1578 has been able to reach the ocean floor. Not all have been able to resurface, though.
Face Mountain
It is varied and includes features such as submarine canyons, atolls, and mid-ocean ridges.
An underwater volcano is called a submarine volcano.
It is varied and includes features such as submarine canyons, atolls, and mid-ocean ridges.
Two topographic features of the ocean floor discovered with sonar are underwater mountain ranges known as mid-ocean ridges and deep ocean trenches. Sonar technology allowed scientists to map these submarine structures and gain insights into plate tectonics and the Earth's geology.
Seamount
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.
The largest mountain in the world, measured from base to summit, is Mauna Kea in Hawaii. While Mount Everest is the tallest mountain above sea level, Mauna Kea is taller when measured from its base on the ocean floor.