Here's a photo from the plane we flew into Lady Elliot Island on the Great Barrier Reef. You can see the island itself (composed of dead coral) surrounded by a reef. The strip going all the way across the island is the "landing strip". It's not paved or anything; just clear of trees and stuff.
It was fairly amazing landing on this dot in the Pacific, tens of miles from any other land (except other reef islands). I was really amazed to get out of the plane, look to my left and see the Pacific, then look to my right and also see the Pacific. I don't think I'll soon forget that feeling.