Which of the following river forms the natural boundary in the west side of Uttarakhand ?

Alaknanda
Bhagirathi
Tons
Kali

The correct answer is (d) Kali.

The Kali River is a trans-boundary river that flows through the Indian state of Uttarakhand and the Nepali state of Sudurpashchim Pradesh. It is a tributary of the Mahakali River, which in turn is a tributary of the Ganges River. The Kali River is the natural boundary between India and Nepal in the west of Uttarakhand.

The Alaknanda River is a tributary of the Ganges River. It flows through the Indian states of Uttarakhand and Uttar Pradesh. The Bhagirathi River is also a tributary of the Ganges River. It flows through the Indian state of Uttarakhand. The Tons River is a tributary of the Yamuna River. It flows through the Indian states of Himachal Pradesh and Uttarakhand.

The Kali River is a major river in the Indian subcontinent. It is a source of water for irrigation, drinking water, and hydroelectric power. The river is also a popular destination for tourism.