Some of the world’s tallest mountains are found underwater. Seamounts are often the remnants of extinct volcanoes and come in a variety of shapes and sizes. They are in every world ocean basin and while it is not yet known precisely how many seamounts there are, estimates suggest that there are at least 10,000! Seamounts rise up high in the water column, creating important habitat and complex current patterns that influence life on and around them. Explore the resources below to discover more about the unique ecosystems on and around these mountains of the deep.