The Depung monastery has an area of 250,000 square meters. The main structures include the Main Assembly Hall (Tshomchen), four Tantric colleges and Ganden Palace (Ganden Potrang). The tshomchen of Drepung, covering 4,500 square meters and supported by 183 pillars in the center of the monastery, is the best known, most powerful tschomen of all the monasteries in Tibet. It can seat 8,000 monks. In addition, a great deal of ancient books and sutras are preserved in the monastery.