Liberio was a Marleyan city located on the northeastern part of the mainland that contained an internment zone, a designated area of land for Eldians on the mainland to live in. It was the hometown of many of the main characters of the story.
History: Not much known about the town's history except it was known for the huge concentration of Eldians in the city. Rather than be exterminated, the Marleyans offered "mercy" to the Eldians by forcing them to live in designated interment zones. However, its true intent was to store the Eldians to use the Founding Titan as weapons to conquer the world.
Story: During their days spent in the 104th Cadet Corps, Reiner and Bertholdt claimed that their hometown lied in the southeastern mountainous region of Wall Maria and that their town had been overrun by Titans without warning during the fall of Wall Maria. Reiner in particular expressed a strong desire to return to his hometown in the future. During the Wall Rose invasion when the Scout Regiment recruits battle the Titans at Utgard Castle, Reiner comes close to death by a Titan and fears for the end of his life before he is saved by Bertholdt.
Source: Liberio (Anime), available under CC BY-SA 3.0.