What country does South Korea share its only border land with?

North Korea.

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To find out which country shares its only border with South Korea, we can consult a map or use a reliable source of geographic information. South Korea shares its only land border with North Korea.

To verify this information using a map, you can follow these steps:

1. Open a web browser and search for "Map of South Korea and North Korea border."
2. Click on one of the search results that provides a map showing the border between the two countries.
3. Study the map to locate the border between South Korea and North Korea. You will see that the border runs along the Korean Demilitarized Zone (DMZ).
4. Confirm that North Korea is the country that shares its only land border with South Korea.

Alternatively, you can consult reliable sources such as encyclopedias, country profiles, or government websites to find the answer to this question. These sources will provide accurate and up-to-date information on the geopolitical situation between South Korea and North Korea.