What is "glotter"

'''Glotter ''' is a river of in the Breisgau region in the south of Baden-Württemberg, Germany which is approximately 30 km long. The spring of this river is located at an altitude of 1040 m amsl on the eastern slope of the Kandel near Neuwelt, a suburb of St. Peter in the Black Forest. It crosses the Glotter dale (in German: Glottertal, which is also the name of a village). In Nimburg, a suburb of Teningen, it discharges into the Dreisam.