The largest river island of the world is in:

The correct answer is Assam . Key Points The largest river island in the world is Majuli , which is situated in the Brahmaputra River in the state of Assam . The island was formed due to course changes by the Brahmaputra River and its tributaries, particularly the Lohit River , in the 18th century following a series of earthquakes and floods. In September 2016 , Majuli was officially declared a district by the Government of Assam , making it the first island district in India. It was formally recognized as the world's largest river island by the Guinness World Records in 2016 , surpassing Marajo in Brazil (which is a fluvial-marine island). The island serves as the nerve center of Neo-Vaishnavite culture, housing several Sattras (monasteries) established by the saint-reformer Srimanta Sankardeva in the 15th-16th century . Additional Information Assam The state is known for its rich biodiversity and is home to the Kaziranga National Park and Manas National Park , both of which are UNESCO World Heritage Sites . The Brahmaputra River , one of the world's largest rivers by discharge, flows through the heart of the state, creating a fertile alluvial plain . Nagaland Located in the northeastern part of India, it is known as the Land of Festivals and is home to the famous Hornbill Festival . Sikkim This Himalayan state is the least populous state in India and is home to Kangchenjunga , the third highest peak in the world. Kerala Situated on the Malabar Coast , it is famous for its backwaters , ayurveda , and high literacy rate.