Well... This is Terraria map that is completely sunken! Only some caves are water free, most of the map is covered with water. Easy starting with little house and accessories. (btw my first ever Terraria map! :D)
Edit: If you are wondering wich file to download, both work the zip file just takes less space from my computer, because I store the maps on it and I want them to take as little space as possible, that's why its there. Also check my other map out too it's pretty cool. :)