Tonndorfbach is a river of Thuringia, Germany. It flows into the Ilm near Bad Berka. The Tonndorfbach flows through the forested sandstoneâÂÂhill region known as Tannrodaer Waldland, a 69â¯kmò natural landscape between Badâ¯Berka, Hohenfelden, Kranichfeld, and Blankenhain.Tannrodaer Waldland belongs to the broader naturalâÂÂlandscape unit âÂÂIlmâÂÂSaaleâ and Ohrdrufer PlateâÂÂ.
The village Tonndorf lies in the valley of the Tonndorfbach at about 326â¯m above sea level. Tonndorfbach thereby drains part of the Tannrodaer Waldland before merging into the Ilm between Bad Berka and Weimar, within the greater landscape region characterized by mixed forests, sandstone hills, and riparian biotopes along the IlmâÂÂvalley.