Namdapha Tiger Reserve was declared in the year 1983 as the 15th Tiger Project of the country with a core area of 1808 Sq. Km and a buffer area of 177 Sq. Km. Namdapha is in fact the name of a river which originates from Daphabum (Dapha is the name of hill, Bum means peak of hill) and meets Noa-Dehing river. This river flows right across in a North-South direction of the National Park and hence the name Namdapha has been given. In local Singphoo language Nam means water or river and Dapha is the name of a clan of Singphoo tribe. The unique geographical position, varied topography, high annual rainfall spreading throughout the year have made this virgin forest very rich in floral diversity wherein not a single species can be termed as the dominant species of the area. The climate condition with favorable rainfall coupled with temperature gradients and high humidity makes the vegetation characteristic of tropical evergreen forests.