Madagascar, officially the Republic of Madagascar is an island country in the Indian Ocean, approximately 400 kilometres off the coast of East Africa across the Mozambique Channel. At 592,800 square kilometres, it is the world's s…Madagascar, officially the Republic of Madagascar is an island country in the Indian Ocean, approximately 400 kilometres off the coast of East Africa across the Mozambique Channel. At 592,800 square kilometres, it is the world's second-largest island country, after Indonesia.