Nelang or Nilang is a river valley of the Himalayas, containing a small eponymous village, in the Uttarkashi District of the state of Uttarakhand, India.

It is close to the disputed Sino-Indian Line of Actual Control (LAC), and is also claimed by China as part of Zanda County of Ngari Prefecture of Tibet.

Some of the nearby villages are Dhumku in the west, and Jadhang (Sang) and Pulam Sumda in the northeast, all of which lie in the Jadh Ganga valley.

A 32–km–long road along the Jadh Ganga river in the Jadh Ganga valley runs from Bhaironghati to Naga via Dhumku, Hawa Bend (~4 km from Bhaironghati, so named because of strong winds, and also notorious for landslides as it is flanked by a sandy steep vertical cliff on one side and a deep river gorge on the other), Pagal Nala (literally the "Crazy Stream" – the local name of the Jadh Ganga River, so named as it is prone to sudden flash floods whenever it rains upstream), Hindoli Ghat (so named due to the feeling of hindola or "swing" experienced by passengers on the zigzag mountain ghat route), Nelang village, Mana a bridge over the Jadhang River, and finally reaches Naga ~6 km east of Nelang.

After cutting a narrow horizontal U-shaped passage on the side of the monolithic cliff, the wooden structure was built inside it in the traditional native style.

In 2015, after India opened these areas for tourism, the wooden stairway was repaired in the native traditional style and reopened in August 2021 after a gap of 59 years.