"With this recognition, Majuli in Assam enhances its bid for @UNESCO world heritage site status," he tweeted.
Majuli, an island in the Brahmaputra river, toppled Marajo in Brazil to bag the coveted title by Guinness World Records earlier this month.
Majuli covers an area of around 880 sqkm but due to frequent flooding in the Brahmaputra river, it suffers heavy erosion.
It is estimated that Majuli, which is home to around 1,60,000 people, has lost around one third of its area over the last 30-40 years.