The term Mayotte (or Maore) refers to the group of islands, of which the largest is known as Maore (Grande-Terre), and it includes Maore's surrounding islands, most notably Pamanzi (Petite-Terre). Mayotte is in the Mozambique Channel, between Mozambique and Madagascar and is the nearest of the Comoros Islands to Madagascar. It is geographically part of the Comoros Islands but the people of Mayotte chose to remain politically a part of France in the 1975 referendum.
In a referendum in 2009, the population of Mayotte approved accession to status of department of France (95.2% voted in favour of departmental status). Mayotte became an overseas department on 31 March 2011 and became an Outermost region of the European Union on 1 January 2014.
Mayotte has a surface of 374 km2 rising to an altitude of 660 m; this island is now developing rapidly. The human population reached c212,645 in the 2012 census. Grande-Terre, geologically the oldest of the Comoros Islands, is 39 kilometres long and 22 kilometres wide, and its highest point is Mount Benara at 660 metres above sea level. Because of the volcanic rock, the soil is relatively rich in some areas. A coral reef encircling much of the island ensures protection for ships and a habitat for fish.
More details can be found at Wikipedia.