ACAL borders four countries—Belgium , Luxembourg , Germany , and Switzerland—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 .