A seamount's a mountain rising from the ocean seafloor that doesn't reach to the water's surface (sea level), and thus isn't an island. These are typically formed from extinct volcanoes, that rise abruptly and are usually found rising from a seafloor of 1,000–4,000 meters depth. They're defined by oceanographers as independent features that rise to at least 1,000 meters above the seafloor. The peaks are often found hundreds to thousands of meters below the surface, and are therefore consi… (More on Seamount)