The Gera is a river in Thuringia, Germany, a right tributary of the Unstrut. It originates in the Thuringian Forest, west of Ilmenau. The Gera is formed in Plaue, by the confluence of the Wilde Gera and the Zahme Gera. It empties into the Unstrut in Straußfurt. The total length of the Gera (including Wilde Gera) is 85 km. The largest towns along the Gera are Arnstadt and Erfurt.