The Nature Reserve is situated along two parallel mountain ridges running from the north-west to the south-west. In the middle of the nature reserve is a valley that separates it into two parts. This valley is the settlements of several local people and a large area of agricultural land.
Pu Luong is the habitat of plentiful of flora. It possesses the primary forest, which can be regarded as closed evergreen tropical seasonal forest. A diverse flora covers the forest with at least 1,109 vascular plant species. Besides, three primary forest subtypes found at the site also play an important role, including primary lowland forest on limestone and schist/shale, primary coniferous submontane forest on limestone and primary submontane forest on basalt.
