78.81 sq kms
Declared as Wildlife Sanctuary in 1985. National Park declaration in 1999
65 km. from Tezpur, Assam
It has 78.81sq km of dedicated core zone
The area comprises the alluvial flood plains of the Brahmaputra. Two distinct alluvial terraces, the lower portion of mere recent origin along the Brahmaputra and older upper portion to its north, are separated by a high bank cutting through the national park from east to west. The national park on the whole is a flat land. "
The altitude ranges from is 45m to 70 m. The southern and eastern boundaries of the park comprise channels, and islands of the Brahmaputra.The western boundary is an artificial boundary demarcated by a trench from villages.
Tezpur is the nearest airport to Orang. However Guwahati has better connections with almost all the major cities to India.
The nearest railhead is Rongapara Both Tezpur and Guwahati are connected very well by the rail network of India.
Orang can be approached from NH 52 through gravel roads running from Orang town and Dhansirimukh. It is about 65km from Tezpur, 127 km from Guwahati. The sanctuary is 15 km off the national highway near Orang town (Dhansirimukh). The distance between Guwahati and Dhansirimukh is 127 km.
Months - October to March - Mornings - 5-15 º C & Evenings - 20-25 º C
Months -April - Mornings - 12-25 º C & Evenings - 20-25 º C
Months - May to June - Mornings - 20-28 º C & Evenings - 30-32 º C
Visitors can enter the area only in the mornings or afternoon preferably on elephant back.
Orang offers two resthouses and one dormitory facility for visitors.
The floral wealth of the park is very significant. The Natural Forest species are like Bombax ceiba, Dalbergia sisoo, Sterculia villosa, Trewia nudiflora, Zizypphus jujuba, Litsaea polyantha, etc. Among the non aquatic grassland species the prominent are Phragmites karka, Arundo donax, Imperata cylindrical, Saccarum spp. etc. The aquatic grass/plants species are Andropogon spp., Ipomea reptans, Enhydra flushians, Nymphia spp., Wichornia spp. etc
Apart from the greater Indian one-horned rhinoceros (Rhinoceros unicornis), which is the dominant species of the national park, the other key species sharing the habitat, are the Royal Bengal Tiger (Panthera tigris), Asiatic elephant (Elephas maxima), hog deer (Axis percinus), wild boar (Sus scrofa). Besides, there are other small mammals like civets, leopards, hare, and porcupines. There are more than 50 species of fish. Among reptiles, turtles like Lissemys punctata, Kachuga tecta, and among snakes pythons and cobras are known to frequent these areas.