The Sea

"“Then I stood still, forgetting war in Middle-Earth; for their wailing voices spoke to me of the Sea. The Sea! Alas! I have not yet beheld it. But deep in the hearts of all my kindred lies the sea-longing, which is perilous to stir. Alas! for the gulls. No peace shall I have again under beech or under elm.”"

- -Legolas, The Return of the King, Book 5, Chapter 9, The Last Debate The ocean is an extremely large biome surrounding Middle Earth and is, as the name suggests, an ocean. It is mostly entirely made of water, and only squids spawn there, but there are islands that may contain mobs in the future.