Introduction to the tranquil river surface: Going up along the river dam, you will see a wide river surface. The river is calm and blue, but the water is so deep that the boat pole cannot reach the bottom of the pool, so we can only paddle. When you enter the water with bare feet, you can touch strange-shaped river snails and pebbles with your hands. Sometimes you can pick up white porcelain pieces that have lost their edges and corners. The blue patterns are still vivid, but it is no longer possible to verify which century they came from. They have been washed and polished by several floods.