Mauritius, officially the Republic of Mauritius, is an island nation in the Indian Ocean about 2,000 kilometres (1,200 mi) off the southeast coast of the African continent, east of Madagascar.
The Treaty of Tordesillas purported to give Portugal the right to colonise this part of world. In 1507, Portuguese sailors came to the uninhabited island and established a visiting base. Diogo Fernandes Pereira, a Portuguese navigator, was the first European known to land in Mauritius. He named the island "Ilha do Cirne" ("Island of the Swan").
Just off the coast of Le Morne, on the island's southwest, Mauritius offers a spectacular illusion. Sand and silt on the ocean floor run off in a way that makes it look like they're pouring down a waterfall -- or like the entire island is being sucked down a vast drain.
It's really just the flow of underwater currents that create the dramatic image. The ocean water is spectacular from the shore, but to see this particular view requires a helicopter ride. Tours are set up just for that.
According to wikipedia.org and cnn.com