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it is the sea of japan witch leads into the pacific answer
The Sea of Japan is between Japan and North Korea.
It is the Sea of Japan.
If you are referring to seas, the Japan sea and the Pacific ocean are on either side of Japan.
If you mean the body of water between Hokkaido and Honshu it is called the Tsugaru Strait.
The Times called the sea between Korea and Japan the 'Sea of Japan' instead of the 'East Sea'.