According to the Records of Yazhou compiled in the 26th year of Guangxu in Qing Dynasty, "Langlang Bay is fifty miles east of Yulin Port", hence Yalong Bay was called "Langlang Bay" in ancient times. It is said that "Langlang Bay" comes from the local Li language and is related to the sand in the bay here. Lang Lang or Lang Lang means white jade, which describes sand as white as jade. Because the bay here is crescent-shaped, it was later called "Yalong Bay". "Yalong River", "Yalong River" and "Lang Lang" are homophonic, but their literal meanings are quite different. When 1992 Sanya Yalong Bay Development Co., Ltd. was established and the State Council approved the establishment of Yalong Bay National Tourism Resort here, the name "Yalong Bay" began to be used uniformly, which meant that this beautiful bay that had been sleeping for thousands of years would take off like a dragon.