Biandukou has been an important pass in history. It could have been through here that the Chinese Buddhist traveler Faxian arrived in Zhangye, Gansu in the end of the 4th century AD.[2] During the Sui dynasty, it was known as Dadoubagu (Chinese: 大斗拔谷; pinyin: Dàdòubágǔ). Emperor Yang of Sui went to Zhangye in 609 AD through Dadoubagu, where many people died from cold weather.[3]
^薛兴元 (2005-12-20). "扁都口旅游景区开发项目". Xinhua News. Archived from the original on 2016-03-04. Retrieved 2012-02-23.
^张得祖 (2010-08-20). "古玉石之路与丝绸之路青海道". Xinhua News. Archived from the original on 2016-03-04. Retrieved 2012-02-23.