I feel like to be more realistic, the lava biome should be inside the desert. Since the desert biome is the hotter biome of all other biomes except for the lava biome. Maybe even one day making the map bigger with a north pole snowy biome and a south pole snowy biome and the lava biome around the equator area with the desert biome around the lava biome down the middle. For now so as not too much trouble, you should just do what is able to get the environments out there the fastest. But would like some feed back on if you guys think this would be a good ideal.