 In the town, whose area covers 111.29 km², live 8,568 inhabitants.Sontra lies between Bad Hersfeld (some 30 km to the southwest), Kassel (some 45 km to the northwest) and Eisenach (some 35 km to the east), east of the Stölzinger Gebirge, north of the Richelsdorfer Gebirge and west of the Ringgau (ranges), and also 16 km southwest of Eschwege.Flowing through town are the river Sontra, which near Wehretal empties into the Wehre, and the river Ulfe, which empties into the Sontra near the outlying centre of Wichmannshausen.