Explanation:

Vikramshila Gangetic Dolphin Sanctuary is located in Bhagalpur District of Bihar, India. The sanctuary is a 60 km stretch of the Ganges River from Munger to Kahalgaon in Bhagalpur district. Designated in 1991, it is protected area for the endangered Gangetic dolphins in Asia. Once found in abundance, only a few hundred remain, of which half are found here. The Gangetic dolphins have been declared as the national aquatic animal of India. This decision was taken in the first meeting of the National Ganga River Basin Authority (NGRBA) chaired by Prime Minister Dr. Manmohan Singh on Monday, 5 October 2009.