town Jews, forbidding them to deal with agricultural products, and chant at the synagogue. Population change Geography Aach is situated at the edge of the Hegau — a volcanic landscape between Lake Constance and the Swabian Alb mountains. To the north, behind the Upper Danube, is the Swabian Alb. A few kilometres to the east and southeast are the branches of Lake Constance, Überlinger See and Zeller See.The German–Swiss border lies about 14 km to the southeast. The neighbouring settlements are Eigeltingen in the north, Orsingen-Nenzingen in the east, Volkertshausen in the south, and Mühlhausen-Ehingen in the west. Land zoning The following table shows the percentage of land in the town allocated for specific users, as of 31 December in the respective years. Law and government Aach has formed a cooperation with the nearby City of Engen sharing some of its administrative domains. Aach has a city council with ten seats. The last elections in 2017 brought three 5 for the CDU, and five seats for independent voters' associations. Aach's mayor is Manfred Ossola, elected in 2017 with 97.42% of the vote at a 70.4% turnout rate. He proceded the term of Severin Graf, mayor from December 2001 until December 2017. Coat of arms Blazon: "In red a golden (yellow) lion with three silver (white) stars distributed between the paws." Significance: The lion can be considered as an indication of the affiliation to Habsburg. The stars served to distinguish it from the coat of arms of the dominion. Landmarks Buildings The old town hall at Stadtstraße 38 was named as "monument of the month" for November 2008 by the Denkmalstiftung Baden-Württemberg. On the edge of the town lies the old ruins of the Tower of Aach, dating back to the 11th century. Natural beauties The Aachtopf, the strongest spring in Germany, is located in the town area of Aach. The Aachtopf is the source of the Radolfzeller Aach, which flows into Lake Constance. It is fed by the water of the Danube, which seeps northwards about twelve kilometres (as the crow flies) from the source of the Aach between Immendingen and Fridingen in the karstified limestone of the White Jurassic (Danube seepage) and emerges here with an average discharge of 8,300 L/s (minimum 1,300 L/s, maximum 24,100 L/s). For more attractions in Aach, see the respective list on the German wikipedia. Economy and Infrastructure Business Various commercial enterprises are located