It's said that Cupiditas was burned by a large dragon due to the sins of all it's inhabitants.
The current leader of Cupiditas is called Gol D. Rogue, a women of extreme ideals and extrem power. The kingdom is not as harshly run as Cupiditas but is still harsh in the fact that the government does nothing to help those who cannot afford necessities therefore have a lower quality of life.
The Kingdom is mainly comprised of flames and molten rock. However the houses and people are have been developed an immunity to heat, therefore being able to treat the flames as nothing. The kingdom of Cupiditas is roughly around the size of Florida with it's capital, Leere, being roughly around the size of Atlanta.