The Internet is a wonderful tool for finding the answers to important questions. Sometimes they're questions you desperately need to answer, like "What's the capital of Cuba?" or "Why did I wake up on the floor this morning?"
And sometimes they're questions you didn't even know you had, like "What would Game of Thrones look like in the universe of Super Mario World?"
Well here's your answer, courtesy Redditor titan413. You're welcome. (Click the image to see the whole map in its wonderful 16-bit glory.)
Game of Mushroom Kingdoms [Reddit]