Among the numerous lakes which belonged to the duchy are the Mummelsee, Wildersee, Eichenersee and Schluchsee, but none of them is of any significant size.
Suurhertsogkonda kuuluvate arvukate järvede seas on Mummelsee, Wildersee, Eichenersee ja Schluchsee, kuid ükski neist pole küllalt suur.