What sea areas or islands in China are disputed with other countries?

All the sea areas in China are disputed with foreign countries, and there are too many islands to list. The main reason is that I can't remember that the East China Sea is disputed with Japan, the Yellow Sea is disputed with South Korea, and it is unclear with North Korea. However, North Korea may provide China with an export to the Sea of Japan, so the Yellow Sea dispute doesn't matter. In the South China Sea, it is disputed with the Philippines, Vietnam, Malaysia, Indonesia and Brunei, and it is the most troublesome sea area. Because the South China Sea is 3 million square kilometers, the area is too large for the existing naval forces to manage, and China is also suspected of bullying the small. Of course, the bigger our own motherland, the better. However, some foreign countries don't like China, because some islands and reefs used by China to mark territorial waters in the South China Sea are underwater all the year round. Actually, it's already very difficult in China, Nanhai, haha.