evidence: Dandong, in the Liaoning Province of China, on the Yalu River delta, is the largest city on the border.[3] On the other side of the river is the city of Sinuiju in North Pyongan Province, North Korea. The two cities are situated on the Yalu river delta at the western end of the border, near the Yellow Sea. Their waterfronts face each other and are connected by the Sino-Korean Friendship Bridge. There are 205 islands on the Yalu River. A 1962 border treaty between North Korea and China split the islands according to which ethnic group were living on each island. North Korea possesses 127 and China 78. Due to the division criteria, some islands such as Hwanggumpyong Island belong to North Korea even though they are on the Chinese side of the river. Both countries have navigation rights on the river, including in the delta. The source of the Yalu River is Heaven Lake on Paektu Mountain, which is considered the birthplace of the Korean and Manchu peoples. This lake is also the source of the Tumen River which forms the eastern portion of the border.