Downunda

Downunda is a very large island (you could call it a continent) with many different kinds of Mobians living in it. It also has a long history, though most of it is unknown. There's a huge crater in Downunda, which is the spot where the Floating Island rose up into the skies. When Robotnik took over Mobotropolis, he set-up Crocbot as his sub-boss in Downunda who terrorized the residents until he was finally stopped by the Downunda Freedom Fighters when they helped Antoine & Bunnie escape. It is also the place that some rare ore is found--the ore Robotnik needed for his Ultimate Annihilator. Downunda is where Athair seemingly resided with the Ancient Walkers, at least by the time Tails made his first visit to the place he did.