The ocean is a natural extension of land through watersheds. In marine development activities, the production links such as marine fishing, marine transportation, marine mineral development and marine aquaculture are jointly completed in the sea and river basins; while the production links such as sea salt industry and seawater utilization are completely completed on the land. In addition, while the development of modern science and technology promotes the progress of marine science and technology and the development of marine industries, the development of marine high-tech and the emergence of new products have also promoted the progress of land science and technology and the development of related industries. Marine and land products have been interactively developed through this technological extension.
The text means that marine economy and river basin economy are intertwined in industry.