The document presents information about the three major Himalayan rivers - the Indus, Ganga, and Brahmaputra. It notes that the Himalayan rivers get water from rain and melted snow. They have large basins and catchment areas and flow through V-shaped valleys, forming large deltas where they empty into the sea. Specifically, it provides details about the lengths and courses of the three rivers, including that the Ganga river makes the largest delta at Sundarban and the Brahmaputra is known as the Tsang Po in Tibet.