Lake Rosa (locally known as Lake Retba) is located north of the Senegalese Cape Verde peninsula, in the northeast of the African country. At a distance of 35 km from Dakar. It has an area of 3 km². The adjective pink comes from the color of its waters, which become especially pinkish during the dry season. This is due to the Dunaliella salina bacteria ( a type of halophile unicellular green algae), that makes a red pigment to absorb sunlight. The high level of salinity allows people to float easily, just like in the Dead Sea.

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