The Alamut geographic region is a region in Iran including western and eastern parts in the western edge of the Alborz range, 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, are significant themes in nature's composition of this area. Two big citadels of Ismailis, Lambsar and Alamut castles, are in this area. Hassan-i Sabbah and his Hashshashin controlled the area for many years.
In 1090 CE, Hassan Sabbah, the leader of Ismailites in Iran, chose the Alamut region as his headquarters to campaign, preach and convert new followers. This proved to be a turning point for the destiny of Alamut Valley. The result of over two centuries of Ismailite stronghold, the region witnessed numerous castles throughout, of which at least 20 “castles“ dating back to this era have been identified. The most magnificent castle in the Alamut Valley is the Alamut Castle, which is built on top of a high rock reaching 2163 m above sea level near the Gazor Khan Village. The rock is 200 m high and covers an area of 20 hectares (49 acres); with its steep slope and deep and dangerous ravine, the rock is practically inaccessible and forms a part of the fort’s structure. Currently, only ruins of the fort and some towers are apparent, and it is only through archaeological excavation that the main portions can be discovered.
Ovan lake is a small alpine lake in Alamut region of Alburz range, in Qazvin province of Iran. The centre point of the lake is approximately located at 36°28′58.98″N 50°26′37.39″E. The only tributary that flows into the lake, is a stream with the same name, Ovan, coming down from northern mounts. The north of the lake is also surrounded by three small villages, namely from east to west: Varbon, Ovan and Zar-abaad.