Black desert or aghda desert located in 40km north of Ardakan city. Aghda desert shaped like a crescent moon and in the inner arc of it,black mountain with 2050 meters height is lacated. In southern part of this desert,between bloated lands and salt marshes,there is a swamp. In aghda desert there is no vegetation. MOST OF THIS DESRT SURFACE BECAUSE OF HIGH SALTINITY AND HIGH LEVELS OF UNDERGROUND WATER IN DESERT ARE BLOATED AND ROUGH. Because of existence of higher ground in around,surface floods flowed more to desert and for saltinity of environs ground left they salt in this pond after evaporation.