"Officially the Republic of Mauritius is an island nation off the coast of the African continent in the southwest Indian Ocean, about 900 kilometers (560 mi) east of Madagascar" in WIKI
I really enjoy the stamps on this cover! Colourful and with local related themes.
The left isolated stamp belongs to set of 6 stamps issued this year 2007 about corals. The one shown here is the Head Coral.
The other 2 stamps were issued last year 2006 about Ecology in a 4v set - Artificial Reefs and Erosion Control.
The Mauritius Marine Conservation Society, the Mauritian Scuba Diving Association and the National Coast Guard with the help of the Mauritius Marine Authority have created such artificial reefs by sinking 14 vessels around Mauritius since 1980, in depth of 12 to 73 meters of water.
During the mid 20th century, in Rodrigues, the Agricultural Department developed the concept of terraced areas, to fight erosion and to make arable land available to a maximum number of families.