The Wilde Graben, also called Flutgraben or Wilde Leina, is a left tributary of the Nesse in district of Gotha in Thuringia, the upper reaches of which runs through the town of Gotha.

It is fed to no small extent by the Leina channel, which was already built in the Middle Ages and supplies it with water from the Thuringian Forest, which is branched off by bifurcation from the Hörsel upper reaches Leina as well as from the upper reaches of the Apfelstädt from the system Gera/Unstrut/Saale/Elbe.

[1] The Ratsrinne originates in the southwest of Gotha, immediately southwest of the district Sundhausen, at the former railway line, near the aqueduct of the Leina Canal.

From here the brook first flows 5.3 km[1] in east-north-eastern direction and drains a catchment area of about 20 km² via mainly right tributary brooks, until in the eastern south of the town centre the Flachsröste (Töpfleber Graben), which is only 2.5 km long but drains a good 10 km², flows to it from the southeast.

From here the actual Wild Rift begins, which from now on turns canalized to the north and finally to the northwest and still in the core city area takes up the Leina Channel.