The Filsursprung is a karst well at Wiesensteig, on the Middle Swabian Alb in Baden-Wuerttemberg. It forms the origin of the Fils, in a dry valley, the Hasental, at 625 m above sea level. NN springs.
The dry valley and the Filstal to Geislingen / Steige are parts of the original fils, which flowed into the south-draining Ur-Lone. (The old river system of the so-called Tübinger and Cannstatter Ur-Lone dehydrated the southwest German layer stratum - from the Neckar to the Molasse basin of the Alpine foothills, more recently, after the emergence of the Urdonau, to her). Erosion degradation of the Albtraufs to the south and increased Krustenaufwölbungen in the course of Alpine folding reversed the drainage of rivers so that they dewatered to the Upper Rhine Graben. From an upper part of the old river system of the Ur-Lone became the so-called "Rheinische Fils".
The Filsursprung pours 50-240 liters per second (average 160 l / s). After only 2 km, the Fils in Wiesensteig to max. 4000 liters / s of water. The spring rises at the boundary of the layers of the White Jurassic (Malm) (Wα / Wβ, or ox1 / ox2). The non-karstified layer of lower white jumbo gel (Wα) acts as a water reservoir. In the upper Filstal, lard is deposited. Approximately 5.5 km after the source there is an inaccessible Kalktuffhöhle near Mühlhausen. 
The now only moderately loaded  industrial river Fils flows after 63 km and a total of 377 m gradient at Plochingen in the Neckar.
May 14, 2019
I run the track very often. My start is in Kirchheim unter Teck, sometimes via Schopfloch and Neidlingen via Reusenstein. It is a very nice hiking path. The destination is always Wiesensteig. There a hearty stop in the inn Selteltor. An absolute recommendation of my part. Have fun 😉
August 14, 2018
The valley at "Filsursprung" is located near Wiesensteig in the district of Göppingen in Baden-Württemberg.
- wonderful landscape with beautiful meadows
- the source "Filsursprung" rises in this idyllic valley
- Especially on weekends and during the holiday season or when the weather is great, it attracts sports enthusiasts, cyclists and hikers to this valley - heavily frequented
- especially the source with its resting places is a very popular destination for young and old
June 14, 2020
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