16 Scariest Deadliest Rivers in the World

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8. Tárcoles River (Costa Rica)

One of the scariest rivers in the world provides habitat to the American crocodiles resulting in the world’s largest crocodile population with about 25 crocodiles living per square kilometer. It’s also one of the most polluted rivers in Costa Rica. There are guided boat tours through the river if you dare to take one. But remember to keep your head and arms inside the boat.

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