Which state of India has created the first island district of India?

The correct answer is Assam. Key Points The Assam state of India has created the first island district of India. The state of Assam has declared Majuli island as the first island district of India. Majuli island is formed by the river Brahmaputra and its anabranch (substream of a braided river) Kherkutia Xuti, on its confluence with river Subansiri. The area of Majuli island is 352 sq. km. It became the world's largest riverine island in 2016. Before this Brazil's Marajo island on the Amazon river was the one. It was formed by course change and splitting of river Brahmputra and its anabranches during the 17th century.