Zwiesel
The town of Zwiesel  is in an valley basin at the foot of the mountain range formed by the peaks of the Großer Arber (1,456 m), Großer Falkenstein (1,315 m) and Kiesruck (1,265 m), exactly at the spot where the two rivers, the Großer Regen and the Kleiner Regen join and form the Black Regen. It is 10 km to the north-east of the district town of Regen, 35 km from the town of Deggendorf, 30 km from the town of Grafenau and 15 km from the border crossing point at Bayerisch Eisenstein, entry point to the Czech Republic.