North and South Korea.
They are still at war to this day.
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The Korean Demilitarized Zone (DMZ) is often considered one of the most defended borders in the world. It is heavily fortified and patrolled by troops from South Korea and North Korea, as well as monitored by the United Nations.
With today's technology, there are many virtual worlds that exists. The most famous virtual worlds include World of Warcraft, Sim City, and Second Life.
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Kilauea is known as the "World's most active volcano".
The mountain range that covers most of Siberia's border is the Urals. The Urals stretch from the Arctic Ocean in the north to the border of Kazakhstan in the south, dividing Western Russia from Siberia.