Dear Student,
Answer of your 1st question is as: Majuli is the world's biggest waterway island. This pleasant waterway island is arranged on the Brahmaputra River, and had overturned Marajo in Brazil to secure the best position as world's biggest stream island.
Majuli signifies "the land between two equal streams", and the island was framed by the converging of Brahmaputra and its anabranches in the Indian province of Assam. It is arranged in the upper scopes of the stream Brahmaputra. Consequently, Majuli is the biggest possessed riverine island on the planet.
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Regrads.