Alborz Province as Iran's smallest province in area, has 6 counties, Karaj County, Savojbolagh County, Taleqan County, Eshtehard County, Fardis County and Nazarabad County. Karaj, capital of Alborz province, north-central Iran, is a large suburb of Tehran, which lies about 20 miles (32 km) to the west. Karaj is situated in the foothills of the Elburz Mountains, and a fertile agricultural plain extends to the south.
The earliest records of Karaj date back to 30th century BC. The city was developed under the rule of the Safavid and Qajar dynasties, and is home to historical buildings and memorials from those eras. Although it was a stopping point on the busy trans-Elburz caravan route, the town itself was small until the early 20th century, when the Iranian government made efforts to establish an industrial centre there. The modern city produces steel, automobiles, machinery, textiles, paper, and food products.
Amir Kabir Dam and some other small lakes are based in Karaj. The city is a starting point for a drive along road forced north through the Alborz mountain to the Caspian Sea.