Definition: The Sindhu (the Sanskrit name of the Indus River) is a long important river in Asia, running 2,900 km (1,800 mi.) from the Kailash Mountain in Tibet to Arabian Sea in Karachi, Pakistan. The Sindhu is part of the rivers of the Punjab and meets up with the Ganga (Ganges). Along the banks of the Sindhu, the Indus Valley was the home of early civilizations in the Pakistan/India region, especially the civilizations of Harappa and Mohenjo-Daro.
Examples:"Sapta Sindhus" in the Rig Veda refers to the Sindhu, 5 tributaries, and the Saraswati, according to Pakistan - Indus River [formerly at: www.travel-culture.com/pakistan/indus_river.shtm].