What is the name of the Red River in Datang Yunnan?

It's called the Red River. Honghe Hani and Yi Autonomous Prefecture is located in the southeast of Yunnan Province, bordering Kunming in the north, Wenshan in the east, Yuxi in the west and Vietnam in the south. The Tropic of Cancer extends from east to west. The Red River is the epitome of Yunnan's economy, society, humanity and nature, the birthplace of Yunnan's modern industry, and the land passage and bridgehead from China to ASEAN.