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Introduction to Chengbo Bridge: Chengbo Bridge is located on the Chenfang River, 20 kilometers west of Hekou Town. It is a stone pier-beam bridge with six piers and five holes, with a total length of more than 60 meters. There are brick and stone door houses built at the east and west bridge ends, with bluestone as the door frame lintel. The foreheads of the two gates are respectively engraved with "The river is clear and the sea is calm, the wind blows and the waves are calm", which is said to be the handwriting of Chengbo.