Where is the East China Sea located in relation to China, Taiwan, Japan, and South Korea?

The East China Sea is a marginal sea of the Pacific Ocean located in East Asia. Its geographic position relative to the surrounding nations is defined by the following boundaries:

• China: The sea is bounded on the west by the Chinese mainland. It connects to the South China Sea via the Taiwan Strait, which lies between mainland China and Taiwan. Its northern boundary is roughly marked by an imaginary line extending from the mouth of the Yangtze River to Jeju Island, separating it from the Yellow Sea.12
• Taiwan: Taiwan is situated to the south of the East China Sea, bordering the Taiwan Strait that links it to the South China Sea.12
• Japan: The sea is bounded on the east by the Ryukyu Islands chain and extends north to Kyushu, the southernmost of Japan’s main islands.12
• South Korea: The sea extends northwest to Jeju Island, which is located off the coast of South Korea.12