How did the first bay of the Nu River form? The Nu River from the north all the way south into the vicinity of Bingzhong Luo Ridan Village. Due to the shadow of the cliffs of the mountains, the river flow from north to south was forced to change from east to west. After more than 300 meters of flow, it was blocked by the mountains to go to the road. It was forced to change from west to east. It forms a big U-shaped corner.