* Surface: The surface of the ocean is at sea level, which is considered 0 meters (0 feet) elevation.
* Depths: The marine biome extends to the deepest parts of the ocean, reaching around 11,000 meters (36,000 feet) in the Mariana Trench. This means the marine biome encompasses a vast range of elevations, from the surface all the way down to the deepest trenches.
Therefore, rather than assigning a single elevation, it's more accurate to say the marine biome covers a vast range of elevations from sea level to the deepest ocean trenches.
