River Dhauliganga

Explanation :

Context: A portion of the Nanda Devi glacier broke off in Uttarakhand’s Chamoli district on February 7, 2021,triggering an avalanche and a deluge in the Dhauli Ganga, Rishi Ganga and Alaknanda rivers.

• Dhauliganga, which emerges from Vasudhara Tal, is a left tributary of the Alaknanda.
• The river flows through the Nanda Devi National Park.
• It is joined by the Rishiganga river at Raini.
• It merges with the Alaknanda at Vishnuprayag.

NandadeviNational Park

• The Nanda Devi National Park or Nanda Devi Biosphere Reserve, established in 1982 is a national park situated around the peak of Nanda Devi (7816 m) in the state of Uttarakhand.
• The Park was established as Sanjay Gandhi National Park by Notification in 1982 but was later renamed Nanda Devi National Park.
• It was inscribed a World Heritage Site by the United Nations Educational, Scientific and Cultural Organization (UNESCO) in 1988.