The increased salinity level of the lake is due to the decreased flow of the river, which has been dammed.

[1] The irrigation of the river basin is facilitated by the various hydraulic facilities that were built.

The river is never completely dry because it is fed by the snowmelt of Zagros, except for the delta in the summer.

Bolaghi Gorge is an archaeologically significant valley consisting of 130 ancient settlements going back as early as 5000 BCE.

The first dam on the river was made south of Persepolis during the reign of Darius the Great between 521 and 485 BC.