Ah yes I'm aware of the volcanic origin of most tropical island chains, but this is a fantasy world so the origin is a little different. The archipelago used to be one big continent some thousand years ago but some sort of catastrophe happened which sundered the land and gives it the impression of lots of little islands. That's why the sea floor is fairly uniform too (at least the continental shelf), also cuz I had a week to make this originally and only just got the tools again to be able to edit it. It seems that the rivers are my biggest flaw, I'll certainly revise those and devise a new visual for swamp land. The parallel flowing "rivers" were just for me to visually distinguish where the swampy area's borders are, I probably should have deleted those.