After that, the Glatt flows in a south-eastern to southern direction and takes in some tributaries and flows into Glatten. On the section following its mouth the Glatt below Neuneck then runs through a very narrow and winding valley about 170 meters below the summit of the wooded Schellenberg 640 m above sea level. In Leinstetten, the largest Glatt tributary by far Heimbach, with its almost 25 km length, flows into the valley. About 2 km further down the valley, the river turns left where the small tributary Zitzmannsbrunnenbach meets the Glatt in Bettenhausen to the east-northeast course. On the following, almost 10 kmlong run, only a somewhat more important stream flows into the valley. Then the Glatt flows below the village Glatt from Sulz am Neckar and opposite the district Neckarhausen from Horb am Neckar from the left into the upper Neckar.
Catchment area
The 234 km² catchment area of the Glatt has roughly the contour of a triangle with a western base of about 31 km through the eastern Black Forest. This longest side extends from the northern tip east of Baiersbronn-Klosterreichenbach in the Reichenbacher Wald near the Krähenhartbrunnen, from which the right spring brook Stockerbach has its source, to the southern tip at Schramberg-Waldmössingen, which is close to the source of the largest tributary Heimbach. The catchment area is not even 17 km wide from this western side to the eastern tip at the estuary. On the northeast side, the Nagold borders on the longest part of the catchment area, only finally towards the mouth to that of a less important downstream Neckar tributary. Beyond the entire southeastern watershed no major tributary runs to the nearby upstream Neckar. In the south and southwest, behind a short stretch of the catchment area boundary, the Eschach, which is roughly equivalent to the Glatt, flows to the Neckar. On the largest part of the western watershed the Kinzig collects the water running to the other side. Only at the Schöllkopf between Lossburg and Freudenstadt it is replaced there by the Murg, which at first competes over its right tributary Forbach. Since the large Black Forest rivers Kinzig and Murg flow directly into the Rhine, the western watershed is also a large watershed between the Neckar and Rhine over almost its entire length. Largest elevation in the catchment area is the mentioned Schöllkopf, which reaches a height of 843 m above sea level, and at whose eastern foot the second largest Glatt tributary Lauter has its source.
