Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Pancardina is a location that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. It was a landmass that existed long ago.
The Second Great Civilization was made up of trolls and they lived on Pancardina. Their reputation and crystalline technology on this land influenced people all around the world. The Second Great Civilization used to control other Mobians and made them work as their slaves.
Pancardina was eventually destroyed by an unknown being, wiping out the civilization. The remains live on as a series of islands.