Sera Monastery is one of the 'great three' Gelukpa university monasteries of Tibet. It is located  about 5 km north of the Jokang temple in Lhasa. The monastery had three colleges, namely Sera Mey Dratsang, Sera Jey Dratsang, and Ngagpa Dratsang where buddhist monks used to learn religion. Once a time it was biggest monastery with more than 5,000 monks, but now it houses only a few hundred monks. The library of Sera monastery houses some of the valuable prayer books of Buddhism.