The Korea Strait.
Sea Of Japan
Sea of Japan.
They are separated by a land border at the 38 parallel. There is no sea between them.
A sea passage between Korea and Japan
The Yalu River divides China and North Korea.
The Sea of Japan.
The Sea of Japan
The Sea of Japan
The Sea of Japan separates the island of Japan from mainland Korea.
The East Sea.
sea.
The islands of Japan are situated between the Sea of Japan and the Pacific Ocean. The Sea of Japan separates Japan from South Korea, North Korea, and Russia.
Tsushima Straight and the Sea of Japan
The small stretch of ocean that separates Japan from North and South Korea is called the Sea of Japan. The Sea of Japan also borders Russia.
It is known as the "Sea of Japan," though Korea in particular would prefer it be known as the "East Sea."
-- "The Yellow Sea"In response to the previous answer, the Yellow Sea separates The Korean Peninsula and Mainland China.The 'Sea of Japan' separates Japan from the Asian mainland (including the Korean Peninsula). The 'Korean Strait' also separates the southern coast of South Korea from Japan.Please see a labelled map in the related links below.
Either the Korea Strait or the Sea of Japan.