Question

Why Indus River called the backbone of India and pakustan

Answer 1

Around 60% of the total area of the Indus drainage basin is in Pakistan administered Kashmir.

India-Administered Kashmir has about 15%, Tibet has about 10% and the Republic of India and Afghanistan each have about 7% of the Indus basin catchment area.

The Indus forms the delta of Pakistan and India mentioned in the Vedic Rigveda as Sapta Sindhu and the Iranic Zend Avesta as Hapta Hindu (both sets of terms meaning "seven rivers"). The river has been a source of wonder since the Classical Period.