Question

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

Answer 1

There are plenty of natural resources. If you include the water.
Water used in the desalination process
Sand
The fish
Depending upon the region, there may be things like palm trees.
That's all I can think of right now.

Answer 2

There are many for example shells(spears), rare types of fish, and lots of sand!