Yes this is a big island in the middle of the Brahmaputra river, if fact its the largest river island in the world.  There are rice fields and expanses of water bursting with water hyacinth blossom are everywhere.   The locals are laid-back as no where else in India (as of late).  We enjoyed a wonderful stay at a local guest cottage.  A signature dish of Assam is sour curry and we enjoyed it here every day.  The official report is that Majuli Island is disappearing and because of erosion, it will be gone in 20 years  Try telling that to the locals.  Everyday we rented bikes and tooled around the island visiting, pottery making castes and birding.  The mask makers on Manjuli are world famous and London theater companys order all the masks from Majuli when presenting stories from the Ramayana. Also there are 22 satras (Hindu Vaishnavite monasteries and centers for art).  The Maskmaking center is a satra.  Monks live in small rooms and there is a lot of offering ceremonies on a daily basis.