Alamut is a region including western and eastern parts in the western edge of the Alborz (Elburz) massif, between the dry and barren plain of Qazvin in the south and the densely forested slopes of the Mazandaran province in the north. Starting from Qazvin toward Alamut, passing through the first range of hills, curvatures, forms, scars, wrinkles are significant themes in nature's composition of this area. Two big citadels of Ismailists, Lambsar and Alamut castles are in this area. Hassan-i Sabbah and his Hashshashins controlled the area for many years.