The Ganga isn’t alone in her holy flow. The great river splendidly branches out into tributaries and distributaries that go on to flow in their own enlivening ways. River Yamuna is a tributary and rises in the Yamunotri Glacier, at a height of 6,387 meters in the Uttarkashi district, in the flank of the south-west slopes of the Bandarpunch peak in the lower Himalayas. Some say the source of the river is the Saptarishi Kund, a glacial lake. The Yamuna and its tributaries also form part of the Ganga catchments. The Doaba region drained by the Ganga and the Yamuna is considered to be one of the most fertile regions in the Indian sub-continent.