The province of Zanjan covers an area of 39,370 sq.km. To the east of this province is the province of Hamadan, to the west is the province of West Azarbayjan and to the south is the province of Kurdestan.

The Avan peak rises to about 3,750 m. and is located in the Alborz Mountain Range in the north of Roodbar. This summit is also known as Kheshteh Chal.

The above mentioned is related to the Safavid era. But during the Qajar reign, Sa'dol Saltaneh, governor of the times, was responsible for its repairs, and named the same Chehel Sotune.

It is a place located amongst the mountains of Ardakan and Anjireh (on the way to Tabas) which is at a distance of 46 kilometers from Yazd.

The province of Semnan covers an area of 97,491 square kilometers, to the east of which is Khorassan province, to the north are the provinces of Golestan and Mazandaran, to the west stand the provinces of Tehran and Qom, and to its south is Esfahan province.