Gachsar is a village in Alborz province, on Chalus Road, 65 km north of Karaj city. The altitude of this village is 2230 meters above sea level and it has a mild and favorable climate in summer.
Gachsar is located near the Dizin Shemshak intersection on Chalous Road, and the large and famous Dizin ski slope is only 12 km away from Gachsar. A hotel has also been built near Gachsar to receive tourists.