Alborz Province has a population of about 2.5 million. Karaj is one of the metropolises in Iran, As well as the center of Karaj in Alborz province and the city center. Karaj is considered the third most populous city in Iran after Tehran and Mashhad.Karaj is a submontane city in Iran.

It has become one of the most beautiful tourist regions in terms of natural phenomena for the beauty of its unknown nature, astounding, fresh water rivers,Kurds and very beautiful springs, natural caves, high waterfalls, high mountains, old trees, diverse flora and fauna, mineral waters with healing properties.