Zásada u Rašovic (Kadaň-Zásada u Raš.) is a place, that 1992 belonged to Czechoslovakia and was situated in the administrative region Chomutov.
Zásada u Rašovic (Kadaň-Zásada u Raš.) was formerly part of the German Empire. In the German Empire, the place was called Sosau. The place is now called Zásada u Rašovic (Kadaň-Zásada u Raš.) and belongs to Czech Republic.