Major hydrogeological districts
Major hydrogeological districts of Germany: 1 North and Central German Unconsolidated Rock District; 2 Rhenish-Westphalian Lowland; 3 Upper Rhine Graben with Mainz Basin and North Hessian Tertiary; 4 Alpine Foreland; 5 Central German Fault-block Land; 6 West and South German Scarplands and Fault-block Land; 7 The Alps; 8 West and Central German Basement; 9 Southeast German Basement; 10 Southwest German Basement
Source: BGR & SGD