A massive random generator, one of the many things that you can randomly generate on Donjon is a world. There are a lot of things you can put into the generator, but ultimately you create something that looks a little like this.
This planet doesn’t have much in the way of water sources and so a lot of it consists of desert. The only green parts, with minor exceptions are on the water’s edge. Most likely that’s where the majority of the residents live, too. Or do they? Maybe water is bad for your characters or maybe they just need less of it. Maybe they need the sand or the heat and thus stay away from the water for most of the time.
There is a lot you can do with a randomly created map and it has the power to inspire you if you let it. And if it doesn’t? Well, another map is just a random generation away. It’s fun to play with this site, but make sure if you do find a design you like that you save it, because there does not appear to be anyway to get it back.
In addition to all sorts of potential water, ice, and land ratios there are also different types of maps that it can create including a rotating globe and views of the north and south poles of your world. What kind of world map would you design with this program?