Base terrain, found everywhere there's land adjacent to a large body of water.
The coast forms a continuous strip 1-3 tiles wide which surrounds land on every side.
When a Lighthouse is built in a nearby city, all coast tiles worked by it receive an additional 1 Food.
All sea resources are found on coast tiles.
Coast hexes are the ocean hexes directly adjacent to land. They provide food and gold to a nearby city, but only if that civilization has the Sailing technology. Only naval units and "embarked" land units may enter coastal hexes.