evidence: The shared border between North Korea and China stretches for a total distance of 880 miles, making it the longest international border in North Korea. It is located along the northern edge of North Korea. Beginning at its westernmost point, this border primarily follows the Yalu River, which is home to a total of 205 islands. The governments of China and North Korea agreed on ownership of these territories by taking a census of the populations here. The islands with populations that identified as historically Chinese ethnicities were given to the territory of China, while those islands with populations of historically Korean ethnicities were given to the territory of North Korea. According to the agreement of 1962, only 78 of these islands belong to China and the other 127 belong to North Korea. In the central region of this international boundary is Mount Paektu. This mountain, which stands at 9,003 feet above sea level and straddles the border, is actually an active volcano. The eastern side of the border between these two countries largely follows the course of the Tumen River. North Korea and China share 3 official border railroad crossings. One of these, known as Dandong, is situated between two cities: Sinuiju in North Korea and Dandong in China. Both of these cities are located along the Yalu River and can be reached by crossing the Sino-Korean Friendship Bridge. This bridge was inaugurated in May of 1943 by the Japanese Army, after 6 years of construction. It is one of the most important routes for trade between North Korea and China and can be crossed by vehicle and train.