There is no sea between North and South Korea. The border between the two is on land.
The Asian Countries that occupy the Choson Peninsula (Hanguk Peninsula in South Korea, Korean Peninsula in English) are North Korea (the Democratic People's Republic of Korea) and South Korea (the Republic of Korea). This peninsula extends from Asia between the Sea of Japan & the Yellow Sea.
korean
The eastern Asian countries that occupy the Choson Peninsula between the Yellow Sea and the Sea of Japan are North Korea and South Korea. It is better known in the west as the Korean Peninsula.
Sargasso sea
They are separated by a land border at the 38 parallel. There is no sea between them.
yellow sea
North Korea and South Korea.
China North Korea South Korea
The East Sea.
The Sea of Japan
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The three countries that border the Yellow Sea are China, North Korea, South Korea