Tambach-Dietharz is a town in the district of Gotha, in Thuringia, Germany. It is situated in the Thuringian Forest, 19 km south of Goth…Tambach-Dietharz is a town in the district of Gotha, in Thuringia, Germany. It is situated in the Thuringian Forest, 19 km south of Gotha. Since 2012, Marco Schütz is the mayor. His predecessor was the former lieutenant from the German Army Harald Wrona.