Saarlouis (district)

Saarlouis is a Kreis (district) in the middle of the Saarland, Germany.
History.
The district was part of the Holy Roman Empire. After the Napoleonic wars the area went to Prussia, which in 1816 created the district as part of its Rhineland province. From 1936-1945 it was called "Saarlautern", when the Nazi government tried to exchange the French name for a German one.
Geography.
The main river in the district is the Saar.