Isn't the South Asian subcontinent affected by the southwest monsoon warm and humid air flow? Why is there a desert next to the Indus River?

India is blocked by the Himalayas, and it is difficult for the cold front in the north to go south to South Asia. Therefore, it is impossible for monsoon to cause more precipitation on the vast South Asian subcontinent, but it is mainly concentrated on the south side of the Himalayas, that is, the Ganges River Basin. As can be seen from the map, most of the Indus River does not pass through these places, so it will not be greatly affected by the monsoon.