Oceans consist of large bodies of water blocks. They are typically deep with sloping shorelines, usually with sand near the surface. They sometimes surround small islands. Most coastlines have beaches.
The presence of an ocean on the surface may indicate a lowering of the beginning of magma below it.
Oceans in temperate climates may freeze over during the season of winter. This turns most of the surface blocks into ice. Oceans especially close to the poles may be permanently frozen, and not thaw even in summer.