Zwiesel, Czech: Svízel, is a town located in the lower-Bavarian district of Regen, and since 1972 is a state-approved health resort with particularly good air. The name of the town was derived from the Bavarian word stem "zwisl" which refers to the form of a fork. The fork of the rivers Großer Regen and Kleiner Regen and the land that lies between these two rivers were called Zwiesel.