The meeting of the Black River (Rio Negro) and the Amazon River (or Rio Solimoes) results in this phenomenon of two distinctive coloured water that meet but do not mix. The reason why these waters do not mix is their specific characteristics: different temperature, density and speed. The Rio Negro starts in Colombia, flows for 2,250 km and has its mouth in the Amazon River in Brazil. The River Amazon starts in Peru and ends in the Atlantic Ocean, 6,992 km far from its source. It is the largest river in South America. The famous geographer Alexander van Humboldt was the first westerner to establish the existence of the Casiquiare canal which communicates the River Amazon with another big river: the Orinoco.
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