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

3. Russia and Lithuania

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Border: Spit of Curonian Gross Domestic Product (GDP) estimates: $133 billion (Lithuania) or $4.148 trillion (Russia) at 298 km2. Beautifully situated, the Curonian Spit forms a natural boundary between Lithuania and Russia's Kaliningrad area. This small peninsula of sand dunes, which stretches to a distance of around 98 kilometres, is recognised as a UNESCO World Heritage site because of its distinctive and ever-changing scenery. Russia and Lithuania ©Shutterstock/photopixel The spit was formed by glacial deposits and was sculpted over centuries by wind, sea currents, and human activity. It is home to charming fishing communities, thick woodlands, and ethereal sand dunes. It represents a cross-border dedication to safeguarding and honouring the shared natural heritage of Lithuania and Russia, and it serves as a tribute to the delicate balance between human habitation and environmental preservation.