Lake Namak is a large salt flat and seasonal lake located in the central Iranian plateau near Qom. It is part of the closed basin system of the Dasht-e Kavir and fluctuates dramatically with precipitation.

Lake Namak, known in Persian as Daryacheh-ye Namak, is a large salt flat and seasonal lake on the Iranian Central Plateau between Qom and Semnan. The salt lake has been known since antiquity – its name simply means Salt Lake – and its deposits were exploited as a source of salt for the plateau’s urban populations. The surrounding region was a transit zone on the caravan routes linking Tehran, Qom, and Isfahan to the east, and the lake served as a landmark for travellers crossing the plateau.

Lake Namak fluctuates dramatically between wet and dry seasons and between wet and dry years, expanding to cover several hundred square kilometres in wet periods and contracting to a small brine pool in dry ones. It is part of the closed basin system of the Dasht-e Kavir. In recent decades the lake has been predominantly dry, reflecting the reduced precipitation and increased evapotranspiration affecting the central plateau. Its dried salt surface contributes to dust pollution affecting Qom and surrounding areas.