Driving between the snowy mountains of Sikkim which is a part of Eastern Himalayas in India.

Eastern Himalaya is situated between Central Nepal in the west and Myanmar in the east, occupying southeast Tibet in China, Sikkim, North Bengal, Bhutan and North-East India. The area has been declared a biodiversity hotspot by Conservation International.

Nathu La is a mountain pass in the Himalayas. It connects the Indian state of Sikkim with China's Tibet Autonomous Region. The pass, at 4,310 m (14,140 ft) above mean sea level, forms a part of an offshoot of the ancient Silk Road. Nathu means "listening ears" and La means "pass" in Tibetan. On the Indian side, the pass is 54 km (34 mi) east of Gangtok, the capital of Indian state of Sikkim. Only citizens of India can visit the pass, and then only after obtaining a permit in Gangtok.

Nathu La is one of the three open trading border posts between China and India; the other two are Shipkila in Himachal Pradesh and Lipulekh (or Lipulech) in Uttarakhand. Sealed by India after the 1962 Sino-Indian War, Nathu La was re-opened in 2006 following numerous bilateral trade agreements. The opening of the pass was expected to bolster the economy of the region and play a key role in the growing Sino-Indian trade, but that has not happened. Currently, agreements between the two nations limit trade across the pass to 29 types of goods from India and 15 from the Chinese side. The opening, however, shortens the travel distance to important Hindu and Buddhist pilgrimage sites in the region.

Distant mountains of Bhutan, the Tibetan side, and international border fence as seen from the Indian side at Nathu La.

It is also one of the four officially agreed BPM (Border Personnel Meeting) points between the Indian Army and People's Liberation Army of China for regular consultations and interactions between the two armies, which helps in defusing face-offs. The four BPM are: Chushul in Ladakh, Nathu La in Sikkim, Bum La Pass in Tawang district