War on the Rocks – One Sea, Two Seas, Far Seas, Near Seas? For all the attention they receive as contested Indo-Pacific maritime regions, the strategic differences between East and South China Seas do not always get their due. Each of these bodies of water contains land features claimed by the People’s Republic of China and at least one ally or partner of the United States. To Beijing, the East and South China Seas are all part of its “near seas,” and China continues to take steps to assert control over this space as one unified maritime periphery — which we refer to colloquially as China’s “One Sea.” The disputed land features in these seas are small — islands, reefs, and rocks — but the economic, maritime, and security stakes associated with them are large. Countries around the East and South China Seas, however, are not taking China’s actions passively. In their own unique ways that reject the notion of a single “One China Sea,” these countries are adapting and exploring new methods to assert their own maritime rights.