Cisleithania (, also Zisleithanien, , , , , , , transliterated: Tsysleitàniia) was a common yet unofficial denotation of the northern and western part of Austria-Hungary, the Dual Monarchy created in the Compromise of 1867—as distinguished from Transleithania, i.e. the Hungarian Lands of the Crown of Saint Stephen east of ("beyond") the Leitha River.