The World's Most Interesting Borders: A Journey Through the Weird and Wonderful

2. Panama and Colombia

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Darién Gap is the border. Gross Domestic Product (GDP) estimates: $818 billion (Columbia) or $154 billion (Panama) * Area: 266 km * Located between Colombia and Panama, the densely forested Darién Gap is one of the world's most formidable natural barriers. This 160-kilometre section of wild swampland and rainforest splits off the Pan-American Highway, which normally links Alaska with Argentina. Panama and Colombia on Google/Pinterest Although the Darién Gap is well known for its biodiversity, it is also well known for its difficulties, which include hostile species, difficult terrain, and a lack of roads, which renders it all but impenetrable. In addition to dividing two countries, this natural boundary represents the sharp difference between the linked continents and the untamed, wild beauty that defies human invasion.