Saarlouis

Saarlouis is a town in the state of Saarland, in western Germany, located on the banks of the Saar river. With a population of over 37,000 (2024), it is the fifth-largest city of Saarland and serves as an important regional center. Saarlouis lies near the border with France and Luxembourg. The town functions as the administrative seat of the district of Saarlouis and is part of the cross-border SaarLorLux Euroregion. Saarlouis was founded in 1680 by order of Louis XIV of France as a fortress town designed by the military engineer Vauban. The stronghold was intended to secure France’s new frontier after the Treaty of Nijmegen. The star-shaped fortifications gave the city its characteristic layout, parts of which remain visible today. Saarlouis became part of Prussia following the Treaty of Paris of 1815.