It is hard to tell, from where we are, how wide the river is at this stage, not far from the boarding point of Neemati Ghat, near Jorhat town in Assam. 'As an ocean,' is how a friend had described it to me. Spanning 10 kilometres in places, it does seem endless. Placid in this season, the water comes roaring at the shores in the monsoon, washing away settlements. This intense annual activity creates numerous sand banks, some barren, some fertile enough to support little agrarian communities of river nomads until the next flood. During the ship's passage down the Brahmaputra, which is one of the finest examples of a 'braided' river, a traveller sees many of these makeshift worlds, their transience recalling the rise and fall of so many river-fed civilisations.