Paradis Island

Paradi (パラディ) is an island on which the three Walls Maria, Rose, Sheena, are located. The island is massive in size and is just off the coast of Marley, the refined society where Grisha Yeager hails from.

History
The 145th King of Eldia decided approximately in 743 to build the walls on Paradis, their last undisputed territory, and leave the mainland at the end of the Great Titan War.

The Marley government built a huge border wall around the island to prevent the Titans from escaping to the ocean.

Trivia

 * If turned upside-down and mirrored, the territories of Marley and Paradis heavily resemble the real life continental territory of Africa and the island of Madagascar, respectively.