Explanation:

Majuli, a riverine island in the Bramaputra river in Assam became India's first island district,which also recently became the world's largest river island. Home to an estimated 160,000 people of different ethnic groups, the island is an assembly constituency reserved for scheduled tribes.Majuli replaced Brazil's Marajo to become the world's largest river island in the Guinness Book of World Records.Majuli is the nerve centre of neo-Vaishnavite culture and has been vying for World Heritage Site status. It has been included in the tentative list by UNESCO.