sentences:  Stretching between the Pfullendorf heights and the village lies a flat, wide plain, marshy in places, ringed with low-lying hills, and creased with a small tributary stream from which the village takes its name.Ostrach itself lies almost at the northern end of this plain, but slightly south of the Danube itself.By 7 March, the first French forces arrived there, and the Austrians arrived a day or so later.