This is a great trans-Himalayan river of South Asia. The river’s annual flow is about twice that of the Nile River and three times as that of the Tigris and Euphrates rivers combined. The river’s conventional name derives from the Tibetan and Sanskrit name Sindhu. The earliest chronicles and hymns of the Aryan peoples of ancient India, the Rigveda, mention the river, which is the source of the country’s name. Identify the river.