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 is located in a valley in the northeastern part of Myanmar. It is surrounded by tall mountains on all sides. It has Besula Ridge to the north, Kumen Ridge to the east, and Gaoligong Mountain to the east. Enmeikai River and Mailikai River cross the entire Jiangxin slope from north to south. Inject into the Bay of Bengal. [...] 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.