The correct answer is: Sainj.
Sainj Wildlife Sanctuary is a protected area in the Kullu district of Himachal Pradesh, India. It is located in the Pir Panjal Range, and is adjacent to the Great Himalayan National Park and the Pin Valley National Park. The sanctuary covers an area of 1,000 square kilometers, and is home to a variety of wildlife, including snow leopards, Himalayan tahr, musk deer, and ibex.
The sanctuary was established in 1972, and is managed by the Himachal Pradesh Forest Department. The main purpose of the sanctuary is to protect the wildlife and their habitat. The sanctuary is also a popular tourist destination, and offers a variety of activities, such as trekking, camping, and bird watching.
The other options are incorrect because they are not wildlife sanctuaries. Sechu Tuan Nala is a river in Himachal Pradesh, Rupi Bhaba is a dam in Himachal Pradesh, and Pong Dam lake is a reservoir in Himachal Pradesh.