Introduction to smoke rising from the bottom of the water: Where the Yellow River enters the "Hukou", the turbulence flows down rapidly, causing water mist to rise into the sky, just like billowing smoke rising from the bottom of the water, which can be seen dozens of miles away. The size of the mist at the mouth of the pot is related to the season and flow rate. In spring and autumn, when the flow is moderate and the temperature is not high, the height of the waterfall is more than 20 meters, and the rapids splash, forming water mist that fills the air, which is a scene of "smoke rising from the bottom of the water".