Chenla (simplified Chinese: 真腊; traditional Chinese: 真臘; pinyin: Zhēnlà; Wade–Giles: Chēn-là; Khmer: ចេនឡា; Vietnamese: Chân Lạp) is the Chinese designation for Cambodia after the fall of Funan. That name was still used in the 13th century by the Chinese envoy Zhou Daguan, author of The Manners and Customs of Cambodia. Some modern scholars used the name exclusively for Khmer states of the period from the late 6th to the early 9th centuries.