Lakes of Bakhtegan and Tashak

The lakes of Bakhtegan and Tashak are two depressions within mountains with a height of about 1,558 m above sea level. The Bakhtegan lake, located in Bakhtar Neiriz, is a stretched depression , almost 70 to 100 km long, in a direction of northwest-southeast, covering an area of about 2,000 square kilometers.
Its shores are covered with white-colored evaporite deposits. The shores where there are ophiolite stones possess dark colors.
The Tashak lake, with an area of almost 800 square kilometers, is located on the northwest of the Bakhtegan lake, 160 km east of Shiraz. The only way which connects the two lakes is through the delta of Kor river, which pours into both lakes.
Some islands and small and large peninsulas made of radiolarites, pelagic stones, and Sarvak limestones are seen in the lakes; the most important of which are the islands of Narges and Gonban, in the Tashak lake, and Manak island in the Bakhtegan lake. Their areas change based on the annual rainfall. The highest point in the island of Gonban is 1,734 m above sea levels, almost 185 m above the lake. Bakhtegan is deeper than Tashak and in dry seasons their connection is stopped.
The main supplier of the two lakes is the river of Kor, which originates in the mountains of Baraftab and Musa Khani, 50 km southwest of Deh Bid and after meeting the river of Shadkan, or Shadkam,and passing through Marv Dasht fields it pours into the lakes.
Also the springs that emerge through the dolomite and limestones around supply a remarkable part of their waters.
Their chemical water contains sodium chloride, magnesium chloride, and sodium sulfate (4SO 2Na 2MgCl، NaCl).