[DustyPorViva]

m + level editor?

If you don't mean that... I generated a blank(all water) gmap, then started filling it in. Very early on I found myself having no idea where to take it so I opened the map image in paint and scribbled a rough outline to follow. Because I already started the northern area with the beach, I followed that direction(which formed the crescent shape). It was completely random on my part.