The region of
Basel-
Alsace-
Baden (
Dreiländereck[?] Switzerland-
France-
Germany) is called "Regio TriRhena" (sometimes also: "Regio TriRhenia"). TriRhena means "Three
Rhines", but in this particular case, you could translate it with "the three regions that border (to) the Rrhine". Originally, it was a strategic union of the separate economic areas in that region with a
council (
http://www.regiotrirhena.org/) that was founded in 1995. But the expression is also widely used in the local press to describe the region of the
Upper Rhine itself.