Which countries or regions in the world have changed the surface morphology through reclamation?

I feel dizzy. I don't need to ask this question. Outer Mongolia will definitely not do this. Must be coastal countries and regions. Here, Japan should rank first. Their country is small and has a large population. They just want to occupy more territory. They just turn a small reef under the sea into an island in various ways, saying that it is their island, which means that 200 nautical miles around this island is the Sea of Japan and Vietnam. It should be said that almost every coastal country has done so to some extent.