Indus River

The correct answer is option 'A', the Indus River. The Indus River is one of the longest rivers in Asia and flows northwest between the Zaskar and Ladakh ranges.

Geographical Location
- The Indus River originates from the Tibetan plateau in the vicinity of Lake Mansarovar in western Tibet.
- It then flows through the regions of Ladakh and Gilgit-Baltistan in northern Pakistan, and finally enters Pakistan's Punjab province.
- The river further continues its path through Pakistan and ultimately drains into the Arabian Sea near the city of Karachi.

Direction of Flow
- The Indus River flows in a northwest direction between the Zaskar and Ladakh ranges.
- The Zaskar Range is located in the northern part of Jammu and Kashmir in India and extends into the Gilgit-Baltistan region of Pakistan.
- The Ladakh Range is a part of the larger Karakoram Range and is situated in the Indian union territory of Ladakh.

Significance
- The Indus River holds immense significance for the region as it is a vital water source for both India and Pakistan.
- The river supports agricultural activities along its course, providing water for irrigation and sustenance to the people living in the surrounding areas.
- It also plays a crucial role in the economy of both countries, as it is utilized for hydropower generation.

Conclusion
The Indus River is the correct answer as it is the river that flows northwest between the Zaskar and Ladakh ranges. This river holds great importance for the region, serving as a lifeline for the people living along its course and contributing to the economic development of India and Pakistan.