The Upper Moselle is the name given in Germany to that section of the River Moselle, 45 kilometres long, that runs from the Franco-German-Luxembourg tripoint near Perl to its confluence with the Saar near Konz shortly before Trier. From the tripoint to its confluence with the Sauer, the Upper Moselle forms the border between the German states of the Saarland and Rhineland-Palatinate on the one side and Luxembourg on the other. This stretch of the river known as the Upper Moselle is, however, not the same as the geographical upper reaches of the Moselle, which run from its source near Bussang in the Vosges mountains in Lorraine via Épinal and Nancy roughly as far as Metz.