An ocean reef
Defense 1
Foot n/a
Boots n/a
Treads n/a
Tires n/a
Air 1
Sea 2
Lander 2
Pipe n/a

Similar to Woods, Reefs provide some degree of defense to Naval Units, at the cost of being slower to move through. Note that Reefs only provide 10% additional defense, while Woods provide 20%.

Like Woods, Reefs will hide any Naval unit within it in a Fog of War game, only being revealed if the enemy has a unit adjacent to it. Like Woods, this feature does not extend to Air units; they will be seen as normal if they are flying over a Reef.