BĀDŪSPĀN or BĀDŪSBĀN, FĀDŪSBĀN, mountainous district of northern Iran on the Caspian side of the Alborz mountains, in Ṭabarestān (Māzandarān), known to the medieval geographers. It lay one day’s march to the south of Sārīya (Sārī), had no towns or Friday mosques, but numerous villages. The chief villages were Manṣūra and Ūram Ḵāst where the lord resided.