The Sargasso Sea is unique in that it is the only sea in the world that has no land borders - it is defined entirely by ocean currents. Bermuda lies on its western edge. It was also featured in the pilot episode of Jonny Quest.
i remember when I was a kid, i wrote the author of a book series i read (Encyclopedia Brown) and he actually sent me a letter back with a personal note on the side. it still hangs in a frame in my elementary school library