Introduction to Gudong Sea Dike: Gudong Sea Dike is located on the north side of the Yellow River estuary. Construction began in April 1985 and was completed in July 1988. The total length of the levee is more than 80 kilometers. It lies at the head of the beach and blocks the sea and waves. It is known as the "Great Wall on the Sea". Inside the embankment, there is an endless sea, with seagulls flying and fishing sails dotted. Outside the embankment, the Gudong Oilfield, which consists of more than 40 single wells and well group platforms, appears and disappears, showing the unique charm of petroleum culture everywhere.