11 days ago - Shurenai - Direct link
Technically speaking any RWG world is essentially an island map, iirc? As in, all around the edges is a big open area of water that demarcates the 'edges' of the map.

So, What exactly are you after that isn't accomplished by that? Is it just too large so it doesn't 'feel' like an island? Could try making a 2k world instead of 6/8/10k.