Original sentence: In contrast, China's eastern seaboard is low-lying and has a 14,500-kilometre long coastline bounded on the southeast by the South China Sea and on the east by the East China Sea beyond which lies Korea and Japan
Edited sentence: In contrast, China's eastern seaboard is low-lying and has a 14,500-kilometre long coastline bounded on the southeast by the South China Sea and on the east by the East China Sea beyond which lies Taiwan, Korea, and Japan