Question: why river indus is called lifeline for pakistan

title: Indus River
text: The northern part of the Indus Valley , with its tributaries , forms the Punjab region , while the lower course of the Indus is known as Sindh and ends in a large delta . The river has historically been important to many cultures of the region . The 3rd millennium BC saw the rise of a major urban civilization of the Bronze Age . During the 2nd millennium BC , the Punjab region was mentioned in the hymns of the Hindu Rigveda as Sapta Sindhu and the Zoroastrian Avesta as Hapta Hindu ( both terms meaning `` seven rivers '' ) . Early historical kingdoms that arose in the Indus Valley include Gandhāra , and the Ror dynasty of Sauvīra . The Indus River came into the knowledge of the West early in the Classical Period , when King Darius of Persia sent his Greek subject Scylax of Caryanda to explore the river , ca . 515 BC .