Out of these, 13 are recognized by UNESCO in the World Network of Biosphere Reserves (WNBR) under its Man and the Biosphere (MAB) Programme.  First Reserve- Nilgiri Biosphere Reserve (established in 1986). Largest Reserve: Great Rann of Kutch, Gujarat. Smallest Reserve: Dibru-Saikhowa, Assam. Newest UNESCO-recognized: Cold Desert, Himachal Pradesh (added in 2025).