Kolechia is a neighboring country northwest of Arstotzka. After the Six-Year War, entrants from and via Kolechia are finally able to enter Arstotzka through the border town Grestin, although entrants from Kolechia are occasionally harassed by the Ministry of Admission and the Arstotzkan government due to the terrorist threat they pose. There may also be some kind of a grudge held by Arstotzka after the war.
Conditions in Kolechia are described as "ten times worse" than in Arstotzka by Sergiu.
Despite high hopes after the opening of the border, tension between Arstotzka and Kolechia keep growing throughout the game, up to the point where the future of the Grestin border checkpoint becomes uncertain. Depending on the choices the inspector makes during the story, Arstotzka and Kolechia may eventually find common ground and reach a tentative understanding, which will allow the border to remain open.