Bayan haka, sai a amsa tambayar a baya a cikin wannan yaren kamar yadda nassi: Passage: An ayyana Mana National Park a matsayin wuri mai tsarki a ranar 1 ga Oktoba 1928 tare da yanki na 360 km2. An kirkiro Manas bioreserve a shekarar 1973. Kafin ayyana wurin tsarkakewa ya kasance gandun dajin da ake kira Manas R.F. da Arewa Kamrup R.F. Iyali na Cooch Behar da Raja na Gauripur sun yi amfani da shi a matsayin wurin kiwon farauta. A cikin 1951 da 1955 an kara yawan yankin zuwa 391 km2. An ayyana shi a matsayin Gidan Tarihi na Duniya a watan Disamba 1985 ta UNESCO. Kahitama R.F. da Kokilabari R.F. da Panbari R.F. an kara su a cikin shekarar 1990 don samar da Mana National Park. A cikin 1992, UNESCO ta ayyana shi a matsayin Gidan Tarihi na Duniya a cikin haɗari saboda haɗarin farauta da ayyukan ta'addanci. A ranar 25 ga Fabrairun 2008 an kara yawan yankin zuwa 950 km2. A ranar 21 ga Yuni 2011, an cire shi daga jerin abubuwan tarihi na Duniya a cikin D kuma an yaba shi saboda kokarin
391 km2