Where is the largest riverine island in the world?

Majuli, the largest river island in the world, is a civil sub-division of Jorhat District. It is located 20 km. off Jorhat town (Asom, India). It is a pollution free fresh water island. Total area of the island was 1250 sq.km., now it is about 650 sq.km.
http://www.majuli.info/

Majuli island has an area of about 1080 sq. kms. and is located in the Brahmaputra Valley, Assam state. Majuli enjoys the privilege of being the largest river island in the world. Crested in the bosom of the mighty Brahmaputra and fondly tucked up by Lohit and Khabalu with loving care.
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1) "Majuli or Majoli (Assamese: মাজুলি) is a fluvial island in the Brahmaputra river, in the Indian state of Assam. Majuli is the largest riverine island in the world and the largest freshwater island in South Asia. Manitoulin Island in Lake Huron, Ontario, Canada is actually the largest freshwater island in the world. Majuli had a total area of 1,250 square kilometers (482.6 sq mi), but now having lost significantly to erosion it has an area of only 650 square kilometers (251.0 sq mi).

The island is formed by the Brahmaputra river in the south and the Kherkutia Xuti, an anabranch of the Brahmaputra, joined by the Subansiri river in the north. The island is about 200 kilometres east from the state's largest city — Guwahati, and is accessible by ferries from the town of Jorhat. The island was formed due to course changes by the river Brahmaputra and its tributaries, mainly the Lohit. Majoli is also the abode of the Assamese neo-Vaisnavite culture."
Source and further information:
http://en.wikipedia.org/wiki/Majuli

"Majuli is the largest fresh Water mid-river deltaic island in the world."
Source and further information:
http://www.majuli.org/


2) "River island
The world's largest river island is Ilha do Bananal, a 7,720 sq mi / 20,000 sq km island formed by two channels of the Araguaia River in Tocantins State, Brazil.

Ilha de Marajo, a 15,500 sq mi / 40,100 sq km island in Para, Brazil, is mostly surrounded by channels of the Amazon and Para rivers, but also extends into the Atlantic. It is the world's largest island formed by fluvial processes."
Source and further information:
http://www.worldislandinfo.com/SUPERLATIVESV2.html

Frther information:
http://en.wikipedia.org/wiki/Bananal_Island
http://en.wikipedia.org/wiki/Ilha_de_Marajo

The largest reverine island in the world is placed in Assam.which is placed at brahmputra river.