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Ourthe (French pronunciation: [uʁt] ; Dutch: Ourte; German: Urt) was a department of the French First Republic and French First Empire in present-day Belgium and Germany. It was named after the river Ourthe (Oûte). Its territory corresponded more or less with that of the present-day Belgian province of Liège and a small adjacent region in North Rhine-Westphalia in Germany. It was created on 1 October 1795, when the Austrian Netherlands and the Prince-Bishopric of Liège were officially annexed by the French Republic. Before this annexation, the territory included in the department had lain partly in the Prince-Bishopric of Liège, the Abbacy of Stavelot-Malmedy, the Duchies of Limburg and Luxembourg, and the County of Namur.
After Napoleon was defeated in 1814, most of the department became part of the United Kingdom of the Netherlands as the province of Liège. The easternmost part (Eupen, Malmedy, Sankt Vith, Kronenburg, Schleiden) became part of the Prussian Rhine Province; part of this (Eupen, Malmedy and Sankt Vith) was taken back into Liège province after the First World War, under the Treaty of Versailles.