👉 Reefs are natural formations that form around or in the ocean floor. They are made up of tiny, interconnected sandbars and coves that are filled with water. Reefs can be found at various depths from a few feet to several hundred feet below the surface of the ocean. They provide important habitats for many marine organisms, including fish, crustaceans, and mollusks. Reefs can vary greatly in size and shape, ranging from small islands to massive coral reefs that extend across entire