Abhar or 'Abhar Chay' as is colloquially known is one of the most ancient regions of Iran. Existing evidences reveal that this area thrived and flourished in the 2nd millennium BC., the Medes were responsible for unifying various tribes then existing. It was during the Ilkhanan era that this region also saw progress in the way of communications due to the fact that Soltaniyeh was selected as the capital during the said reign. Communication-wise this importance can be said to exist even today.
The name of this city is derived from the Pahlavi language, a word pronounced as 'Oher'- meaning a place for 'blocking waters'. The original location of this city is known as 'Tappeh Qaleh' and stands on the right bank of the Abhar River. The said area is one of the ancient places of human settlement in Zanjan province, from the very beginning of the 4th millennium BC. The famous Abhar river flows across this region which enjoys a mountainous climate with cold snowy winters and moderate summers.
This township is located in the south-eastern part of Zanjan, experiences a mountainous climate with cold, snowy winters and moderate summers. One of the earliest human settlements dating back to the 4th and early 5th millennium BC. can be recorded here. Tribes such as Khoda Bandehloo and Afshar mingled with the natives of the area, bringing for the renounced Zanjan race. This township includes two cities named as Shoravard and Sajas, to make special mention of a great personality such as Shahabedin Sohravardi who grew up here.
Khoram Dareh is located east of the Zanjan province, in the neighborhood of Qazvin. It experiences a moderate, mountainous climate with cold, snowy winters and moderate summers. Local air currents such as Sardmeh and the warm air current known as Shareh Taake have a share in influencing climate conditions here. Such that these air currents play an important role in agriculture too. The center of this township is the city of Khoram Dareh located between Tehran and Zanjan.
This town is located to the north west of Zanjan province. To its west it has common borders with the province of West Azarbayjan, to the north it is in the neighborhood of East Azarbayjan and to the south stands the province of Kurdestan. Part of this area is mountainous being in the skirts of the Zagross Mountain Ranges, and another part of which is located along the banks of the Qezel Ozan River.
Climate wise this area experiences cold and mountainous weather, with cold, snowy winters specially in the heights and moderate summers. The center of this township is the city of Mah Neshan.
This township is situated in the north east of the province and is the neighborhood of Gilan province. Tarom is a vast, level and somewhat deep valley, situated in the lower basin of the Qezel Ozan River, ending in Manjeel basin of 'Sefid Rood' Lake Dam. This valley is situated between the two mountain ranges of Tarom in northern Zanjan and the slopes of the south eastern mountain ranges of Talesh. In spite of its natural beauty, Tarom is unfortunately an earthquake prone area, and the earthquake in the month of Khordad 1990. proved devastating.
Due to the environment, that is mountain ranges and high summits this region is devoid of rain bearing winds; in the lower regions and along the banks of the Qezel Ozan River, dry and semi-arid conditions prevail, but in the higher regions a moderate and mountainous type of climate exists.
The township of Zanjan is composed of two large valleys known as 'Zanjan Rood' and 'Sefid Rood'. In between which the Qanavol and Angooran Mountains lie. Zanjan has moderate summers and cold winters. The distance between Zanjan and Tehran is 328 km. Zanjan was founded during the reign of Ardeshir Babakan and was then called Shahin or Shahan. With the passage of time, this name changed to Zangan and later came to be called Zanjan. In the book named "Hoddodol Aalam" or "limits of the world", (372 AH.), Zanjan has been described as a thriving, flourishing city with strong ramparts. In the 6th century AH. the Ilkhanans gained power in this territory and the city of Soltanieh was erected and thence known to be the capital of Oljaito.
After the decline of the Ilkhanans, Amir Teimoor attacked Iran and reduced this city to Shambles in the year 786 AH. During the reign of Tahmasb Shah Safavid I in the year 930-984 AH. Soltanieh witnessed further decline. But during the reign of Fathali Shah (the Qajar King) built a summer palace in this city. Today, because of its strategic position both politically and commercially, this city has attracted many immigrants and hereby the increase of population has caused development and increase of city limits.