A beautiful rainbow arched over the magnificent Yellow River's Hukou Waterfall in China's Shanxi Province on Monday, creating an amazing spectacle. The Hukou Waterfall is the largest cascade on the Yellow River, China's second-longest river. This natural wonder, named for its resemblance to a giant kettle pouring water, thunders with turbulent currents as it plunges over cliffs, captivating visitors with its raw, breathtaking power and beauty.