At this point is the source of the Black Elster, which unfortunately has dried up more and more often in recent years due to the severe drought and heat waves. The last meters to the spring lead uphill through rough terrain, which is why it is best to park your bike at the foot of the hill and walk the last 50 meters.
Incidentally, there are different length specifications for the length of the river, which is probably due to the fact that the course of the Black Elster was significantly changed in the middle of the 19th century. Various straightening measures, among other things, severed numerous side arms, which has earned the Black Elster the nickname "straightened water highway".
And the white-black raven bird has nothing to do with the naming, by the way. The name means "to flow" and derives from the Indo-European word "Al-astra" or "Al-istra".