In a unique example of shared sovereignty in Europe, Luxembourg and Germany jointly manage the rivers Moselle, Sauer, and Our, which form part of their border. This unusual arrangement, known as the German-Luxembourgish condominium, means these rivers, including their islands and certain bridges, are not divided by a traditional boundary line but are instead governed by both nations. This system of joint sovereignty traces its roots back to the Congress of Vienna in 1815, where European powers redrew the continent’s borders following the Napoleonic Wars.
The Congress of Vienna’s Final Act, specifically Article 25, established that these rivers would be under shared ownership instead of being divided by a median line. This decision was further solidified by treaties signed in 1816 in Aachen between the Netherlands, which controlled Luxembourg at the time, and Prussia. As Luxembourg gained independence and Prussia became part of the German Empire, these 19th-century agreements’ provisions continued to define the modern border between Germany and Luxembourg.
Despite the shared jurisdiction over the rivers, the status of the bridges spanning them remained ambiguous for over a century. It wasn’t until the canalisation of the Moselle prompted negotiations in 1979, that clarity was sought. This led to a 1984 border treaty that officially incorporated bridges and footbridges into the shared territory, further solidifying the cooperative management of the border region.
The governance of this condominium involves a system of concurrent jurisdiction, where both German and Luxembourgish laws are applicable. Bilateral agreements facilitate the resolution of any potential legal conflicts. Police forces from both countries patrol the shared territory and can conduct joint operations. When offenses occur on these shared rivers or bridges, officers from either nation can intervene, with jurisdiction over legal proceedings depending on various factors such as the individuals involved and the specifics of the incident.
This arrangement between Luxembourg and Germany remains a rare instance of shared sovereignty, setting it apart from the traditional boundary practices observed between most nations. It creates a distinctive border structure that exemplifies cooperative governance in Europe.
