What natural resource are available on the coast that might not be available somewhere else?

There are many natural resources that could be found on the coast that might not be found further inland. Some examples of natural resources that could be found on the coast include minerals like sand, clay, and gravel which might not be found in places that are not near the coast. Other natural resources found on the coast are different types of ores, lumber, and vegetation that may not be found in other parts of the world that are not coastal.