You tie your boat up at a quay built next to the shore; you can take your boat out to explore a cay or key—a small island or reef. Cays and keys are natural; quays are always built by human beings.
quay / cay / key
You tie your boat up at a quay built next to the shore; you can take your boat out to explore a cay or key—a small island or reef. Cays and keys are natural; quays are always built by human beings.