ACAL borders four countries—Belgium ( Wallonia ) , Luxembourg ( Grevenmacher and Luxembourg Districts ) , Germany ( Baden-Württemberg , Rhineland-Palatinate and Saarland ) and Saarland ) , and Switzerland ( Cantons of Basel-Landschaft , Basel-Stadt , Jura and Solothurn ) —along its northern and eastern sides .
Wallonia ( Belgium ) , Grevenmacher and Luxembourg Districts ( Luxembourg ) , Baden-Württemberg , Rhineland-Palatinate and Saarland ( Germany ) and Cantons of Basel-Landschaft , Basel-Stadt , Jura and Solothurn ( Switzerland ) border ACAL to the north and to the east .