The Yalu River, originally a Chinese river, is now the boundary between China and North Korea. What we are seeing is this section of Dandong City, Liaoning Province. Came to the Yalu River and was blown by the wind on the riverside. The bridge on the left side of Figure 4 is the China-DPRK Friendship Railway Highway Bridge. There is a large driveway in the middle of the bridge and a sidewalk on both sides. On the left is the passage to North Korea, and on the right is the passage to China. It took ten minutes to get through the car to the 1980s. The bridge on the right was blown up by the US military that year. Now it is a broken bridge for far-away visits.