4. Montenegro and Croatia
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Boundary: Kotor BayGross Domestic Product (GDP) estimates: $174.55 billion (Croatia) / $2.151 billion (Montenegro) * Area: 25 km Renowned for its visual beauty and historic significance, the Bay of Kotor forms a calm coastal boundary between Croatia and Montenegro. This magnificent Adriatic Sea entrance promotes a lively human flow between the two nations in addition to facilitating natural and cultural contacts. Montenegro and Croatia ©Shutterstock/Hanna Khator Residents of both countries routinely go back and forth via the bay's many ports and villages connected by waterways and roads that provide breathtaking views of the coastline. Both nations' attempts to expedite border crossings have improved this ease of travel, promoting tourism and supporting local businesses.
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