Pani Dihing Bird Sanctuary is located in which one of the following districts?

Pani Dihing Bird Sanctuary is a 33.93 square kilometre (13.10 sq mi) bird sanctuary located in Sivsagar district, Assam. It is 22 km (14 mi) away from Sivasagar town. This protected area was established as a Bird Sanctuary in August 1996 by the Government of Assam. It was identified as a potential bird sanctuary in late 1980s. The first systematic ornithological surveys in the area was conducted by noted conservationist Dr. Anwaruddin Choudhury in 1987 - 88.