The Republic of Madagascar (older name Malagasy Republic, Malagasy: Repoblikan'i Madagasikara [republiˈkʲan madaɡasˈkʲarə̥], French: République malgache ) is an island country located in the Indian Ocean off the southeastern coast of Africa. The nation comprises the island of Madagascar which, at 587,000 square kilometres (227,000 sq mi), is classified as the fourth-largest island in the world, as well as numerous smaller peripheral islands, the largest of which include Nosy Be and Nosy Boraha (Île Sainte-Marie).

The prehistoric breakup of the Gondwana supercontinent separated the Madagascar-Antarctica-India landmass from the Africa-South America landmass around 135 million years ago. Madagascar later split from India around 88 million years ago, allowing plants and animals on the island to evolve in complete isolation. Consequently, Madagascar is a biodiversity hotspot in which over 80% of its plant and animal species are found nowhere else on Earth. These are dispersed across a variety of ecoregions, broadly divided into eastern and south-central rain forest, western dry forests, southern desert and spiny forest. The island's diverse ecosystems and unique wildlife are severely threatened by human settlement and traditional slash-and-burn practices (tavy) which have denuded Madagascar of as much as 90% of its original forest cover. Under the administration of former President Marc Ravalomanana, the government of Madagascar partnered with the international community to implement large-scale conservation measures tied to ecotourism as part of the national development strategy. However, under Rajoelina's caretaker government there has been a dramatic increase in illegal logging of precious woods and the poaching and sale of threatened species such as lemurs in Madagascar's many national parks, several of which are classified as UNESCO World Heritage Sites.