While Madagascar is an island in the Indian Ocean, it is believed to have been originally settled by people of Indonesian and African descent. Others have suggested that the people of Madagascar descended from Indonesians and Africans who mixed before their arrival on the isolated island, but studies prove people of Madagascar came from Borneo and Africa. It is not fully known how the inhabitants came there or if they were there already. Only later did Arabs, Indians, and Jewish immigrants mix into the population of the island. The Malagasy way of thinking is a mixture of cultures, as well as their appearance and fashion style. It is a melting pot. Madagascar is part of the African Union, which is now being reconsidered due to the recent 2009 political turmoil. That said, tourism is an important contributor to the national economy. Madagascar's long isolation from the neighboring continents has resulted in a unique mix of plants and animals, many found nowhere else in the world. This has led some some ecologists refer to Madagascar as, "the eighth continent."