The Black Ernz is the recurring companion of this route. From the starting point at the Heringer Millen, the Mullerthal Trail follows the course of this stream to the picturesque waterfall Schéissendëmpel. You cross the Black Ernz here and above the brook the route runs along a narrow path directly along the slope. After a few meters, there is a spectacular passage over a nearly 90 m long and seemingly floating staircase construction. You continue, following the stream, into the Paaschent forest. After a few meters, the Mullerthal Trail leaves the creek and leads up into the forest for a certain while until it goes down the steps to the geosite Kallektuffquell. Here the Black Ernzis very close again. The Mullerthal Trail now runs parallel to the creek on a wooden bridge that crosses it several times. Then, the MullerthalTrail leads uphill towards Marscherwald known as peaty, light beech wood. In the following section, the MullerthalTrail crosses the Rippsmuer- a high moor - and the Sonnenauer, a sundial, chiseled in arock. The walk continues towards Blumenthal, where the MullerthalTrail meets the Black Ernz again.