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Liberio (レベリオ Reberio?) is a Marleyan city that contains an internment zone (収容区 Shūyō-ku?), a designated area of land for Eldians on the mainland to live in. It is the hometown (故郷 Kokyō?) of many of the Warriors as well as Grisha Jaeger.
The internment zone is separated from the rest of the town by a large wall, guarded by Marley Public Security guards, who have the task of controlling and authorizing who goes in and out of the internment zone.
Some time before the fall of Wall Maria, Reiner Braun, Bertholdt Hoover, Annie Leonhart, and her father lived their days in a settlement which Reiner and Bertholdt would later refer to only as their "hometown." Before Annie's departure from the hometown, her father reassured her that he would support her even if all the world hated her, and that he would only ask that she would return home.
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. At this time he strengthens his will, filled with determination to return to his hometown. He shares his resolve with Bertholdt, who understands the true meaning of what Reiner says and agrees with his hopeful words.
The next morning, when Reiner begins to lose hope for his situation due to an injury inflicted on his arm at Utgard, Bertholdt encourages him by reminding him of their imminent return to their hometown. Not long afterward, the two reveal their Titan identities as the Armored and Colossal Titans and attempt to capture Eren Jaeger.
In the aftermath of the Battle of Shiganshina District, the surviving members of the Scout Regiment learn of the existence of Liberio and the rest of the outside world through Grisha Jaeger's autobiographical writings, kept hidden in the basement of his former home.