A popular high-altitude lake in Arunachal Pradesh is:

Sela Lake
Madhuri Lake
Ganga Lake
Pangong Tso

The correct answer is: a) Sela Lake.

Sela Lake is a high-altitude lake located in the Tawang district of Arunachal Pradesh, India. It is situated at an elevation of 4,310 meters (14,130 feet) above sea level, and is the second highest lake in the state. The lake is a popular tourist destination, and is known for its scenic beauty.

The lake is surrounded by mountains, and is fed by several streams. The water in the lake is clear and blue, and is a popular spot for swimming and fishing. The lake is also home to a variety of birds and animals, including snow leopards, blue sheep, and musk deer.

The lake is accessible by road from Tawang town. The journey from Tawang to Sela Lake takes about two hours. The best time to visit the lake is during the summer months (June-September), when the weather is pleasant.

The other options are incorrect because:

  • b) Madhuri Lake is a lake located in the Kullu district of Himachal Pradesh, India. It is situated at an elevation of 2,935 meters (9,630 feet) above sea level. The lake is a popular tourist destination, and is known for its scenic beauty.
  • c) Ganga Lake is a lake located in the Garhwal Himalayas of Uttarakhand, India. It is situated at an elevation of 4,300 meters (14,100 feet) above sea level. The lake is a popular tourist destination, and is known for its scenic beauty.
  • d) Pangong Tso is a lake located in the Ladakh region of Jammu and Kashmir, India. It is situated at an elevation of 4,350 meters (14,270 feet) above sea level. The lake is a popular tourist destination, and is known for its scenic beauty.