Ice is a type of terrain feature found in polar waters in the extreme north and south of the map. There are two types of ice: * Solid ice. The tiles where the ice forms a complete cover are impassible to all units. * Icebergs. These tiles are found almost everywhere around solid ice, forming just a partial cover of the water. They are passable (although with some danger) for all ships and embarked units. Note that icebergs are found in both Coastal and Ocean waters, and the units will also need the relevant techs to move on them.