Downunda

Downunda is an island continent on Mobius. Many different kinds of Mobians live there, many of which do not live elsewhere. It was the original site of Echidnaopolis before the Floating Island was raised into the sky, leaving a huge crater in the land. Knuckles' grandfather Athair lived in the crater with the Ancient Walkers for many years, until Tails made his first visit to the island.

While Doctor Robotnik ruled Mobius, Downunda was controlled by his sub-boss Crocbot. Crocbot was opposed by the Downunda Freedom Fighters. When Tails came across Downunda during his solo adventure, he assisted in the team's attack on Crocbot's lair. During his attempt to escape, Crocbot's tank was knocked off balance and it fell into the crater. The explosion seemingly killed Athair, as the rising smoke looked like his head and after this Athair had moved on to a higher plane, coming back to Mobius only in the form of a ghost.

It was later revealed that Crocbot had survived the explosion and used some Combots to build a prison camp within the crater, in which Antoine D'Coolette and Bunnie Rabbot were trapped. The camp was liberated by the Downunde Freedom Fighters, finally ending Crocbot's control of the continent once and for all. During the destruction of the camp however, Crocbot succeeded in planet a mind control device on one of the Freedom Fighters, Duck "Bill" Platypus. He used "Bill" to recruit other platypuses to imprison the Downunda Freedom Fighters and take control of the continent again. His plans were foiled by the Freedom Fighters with the help of Sonic and Tails, and his remains were brought back to Mobotropolis. Downunda has lived in peace since then.

Downunda is the only place to find a certain rare ore that Robotnik needed for his Ultimate Annihilator.