In Yanchuan County of Yan'an City, northwest China's Shaanxi Province, the Yellow River carves out five continuous S-shaped bends, collectively known as the "Five Great Bends." As the centerpiece of the Yellow River Shequ (Snake Bend) National Geopark, these natural wonders are famed for their dramatic geology and rich cultural resonance. Among them, Qiankun Bay – hailed as the "No. 1 Bend on the Yellow River" – unfolds like a giant Taiji diagram, where winding waters meet rugged gullies in a scene of breathtaking grandeur. In recent years, the river here has turned clear, a striking transformation that reflects sustained efforts in ecological protection and restoration across the Yellow River basin.