Located within the de-militarized zone between the two countries, this is possibly one of the most heavily guarded borders on the list. In fact, the two countries are technically still at war, and to this day American troops are stationed on the South Korean side.
5. Australia and The Rest of the World
Unconventional as it may be, the coast of Australia and its three surrounding oceans is technically still a border. The country is home to over 10,000 beaches all with stunning scenery like the shallow cove pictured above.
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