It runs west to east, and forms the northwestern edge of the Thuringian Basin.
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The new line runs north of the existing Erfurt-Weissenfels-Leipzig route in the Thuringian Basin past Buttstädt, crosses the Finn hills between Rastenberg and Bad Bibra and crosses the Unstrut near Karsdorf.
Like the Thuringian landgraves, the Honstein clan rapidly amassed a considerable amount of territory, which included the regions around Arnstadt and Gotha in the Thuringian Basin.