If you search, you'd find alot of people do. What I do though is I initially create the tectonic plates of the world, figure all that stuff out, then the climate, and then the landmasses and then finally the mountains. And, only then do I factor in the existence of god and add little tweaks such as a magical catastrophe decimating a peninsula making shard like islands, or a fallen god slamming into the earth initially shattering a plate and causing a massive influx of volcanoes in his crater.