The Nam Ha National Biodiversity Conservation Area (NBCA) has dense forest covering 90% of the area.[2] May to September are the rainy months with average annual rainfall of 1.256 milimét (49,4 in).[7] December to February are the winter months with temperatures touching as low as 5 °C (41 °F). Heavy fog is common in morning hours with warm and sunny mid-days and the average annual temperature is 25,75 °C (78,35 °F)[Chuyển đổi: Số không hợp lệ]. Vegetation zones in its plains are between 540–1.000 mét (1.770–3.280 ft) elevation, consisting of bamboo, secondary evergreen forest and scrub (introduced by humans). In the Northern Highlands zone, between elevations of 1.000–2.094 mét (3.281–6.870 ft), primary every green forest is mixed with secondary forest as well as large patches of Imperata grass. In the Southern Highlands, which range between 1.000–1.572 mét (3.281–5.157 ft) elevations, there is evergreen forest and scrub. Secondary evergreen forests and scrub are found in the Nam Kong area bordering the Chinese border, lying between elevation 600–1.556 mét (1.969–5.105 ft).[8] Wildlife reported from the NBCA are wild cattle such as guar và banteng, Asian wild dogs, tigers, clouded leopard, bears, monkeys and gibbons and also montjack.[2] The conservation area was initially established covering an area of 677 kilômét vuông (261 sq mi) in 1991 which was subsequently enlarged to an area 2.244 kilômét vuông (866 sq mi) (entirely within the province) which borders with Shiang Yong Protected Area in Yunnan Province in China. There are 33 large mammals (of which 22 are key species), including Malayan sun bear và black cheeked crested gibbons, and 288 species of birds (of which 18 are key species). It has been designated as an Asian Heritage Site. One issue of concern is of rubber cultivation in large areas.[8][9]

The Nam Ha Important Bird Area (IBA), 1.845,2 kilômét vuông (712,4 sq mi)[Chuyển đổi: Số không hợp lệ] in size, is located within the Nam Ha NBCA. The IBA altitude varies between 250–2.094 mét (820–6.870 ft) above sea level. The topography is mountainous ridge. The habitat is dry evergreen forest, upper montane forest, and Imperata grassland. crested finchbill (Spizixos canifrons), white-bellied redstart (Hodgsonius phaenicuroides), and white-necked laughingthrush (Garrulax strepitans) are unknown in any other Lao IBA. Confirmed fauna include Assamese macaque (Macaca assamensis) and the ungulate gaur (Bos gaurus).[10]

• Pha Yeung Waterfalls inside
  the Nam Ha NBCA
• Kao Rao Caves inside
  the Nam Ha NBCA