Tang-e Boraq (Boraq Gorge) is another erosive gorge in the north of Fars province, which is located about 160 km from Shiraz and near a village of the same name.
Sarab Garm Spring has two separate parts. The larger part of the area for drinking water supply is enclosed and protected and it is not even possible to visit it.
Various theories have been proposed for this phenomenon, the most likely of which is the increase in ground pressure due to the presence of hydrocarbon gases.