One specific feature of the border is the route of the
Vennbahn railway. The Vennbahn railway route has been Belgian territory since 1919, under the provisions of the
Treaty of Versailles. The Treaty decided that the former German area of
Eupen-Malmedy should be ceded to Belgium, along with the entire Vennbahn railway route which crossed the border several times. Border stones can be found on the right and left of the route. Due to the route of the now defunct railway, six
exclaves of Germany, completely surrounded by Belgian territory, as well as one counter-enclave, were created. Today five German enclaves remain surrounded by Belgian territory, consisting of the village
Mützenich as well as parts of the districts of Monschaus and Roetgens. Following
land swaps, the sixth enclave and the Belgian counter-enclave no longer exist. ==Border formalities==