evidence: Jiangxinpo is located in the northern part of Kachin State, Myanmar, with an area of ​​about 40,000 square kilometers. Jiangxinpo borders my country's Tibet Autonomous Region in the north, my country's Yunnan Province in the east, and Burma's Hugang Valley in the west. [...] Jiangxinpo starts from Zayu County in Tibet in the north, Yeren Mountain in the west, Enmeikai River in the east, and the confluence of the two rivers in the south. It is located on the southwestern monsoon windward slope of the Indian Ocean. It has a hot climate, abundant rainfall and abundant vegetation. It is the most abundant species in the world. The forest coverage rate here is as high as 90%. [...] In 1960, Premier Zhou Enlai and Wu Nu signed the "Boundary Treaty between the People's Republic of China and the Government of the Union of Myanmar". The People's Republic of China abandoned its territorial claim to Jiangxinpo, and then recovered from Myanmar the Pianma, Gulang, and Gang that were invaded by the British in 1913. Banhong and Banlao areas ceded out by the National Government in 1941.