The Manas National Park, Bhutan's crown jewel, is home to the country's most extensive example of tropical and subtropical ecosystems. The ten worldwide biodiversities "Hot Spots" include the eastern Himalayan Royal Manas National Park (RMNP).

It is the most diverse protected area in the Kingdom and one of the most biologically exceptional parks in the world. This park has just recently been opened to the public and includes thousands of animal and plant species, many of which are globally endangered.

Manas, which is located in south-central Bhutan, is connected to India's Manas Tiger Reserve, a World Heritage Site, near the southern border. It shares a border with Jigme Singye Wangchuck National Park to the north. The Royal Manas Wildlife Sanctuary was established in 1966, making it Bhutan's first protected area. In 1993, the area received the designation of National Park.

The critically endangered Royal Bengal tiger, Asian elephant, larger one-horned rhinoceros, clouded leopard, Himalayan black bear, Gangetic dolphin, and pangolin are just a few of the animal species found in Manas. The golden langur, an exceptionally rare primate with long, silky blond fur that is found almost nowhere else in the world, is a primate of great elegance and beauty.

More than 365 bird species have been formally identified in Royal Manas National Park, and 200 more are thought to be permanent residents. Rufous-necked hornbills, Pallas fishing eagles, great white-bellied herons, spotted wren-babblers, blue-headed rock thrushes, and emerald cuckoos are among the species that can be found here. Over 900 different plant species make up the park, many of which are significant in commercial, medical, traditional, and religious contexts. 

More species are anticipated to appear. Twelve species of IUCN-listed birds, including two critically endangered species, five vulnerable species, five near-threatened species, and six restricted-range species, are found in the park, along with two bird species that are completely protected and listed in Schedule I of the Forest and Nature Conservation Act, 1995. From the park area, two further new species, the Malayan Night Heron and the Black Baza, have recently been identified for Bhutan.

The park's climatic conditions vary greatly in terms of temperature and rainfall. When monsoons are at their heaviest, the southern portion of the park experiences rainfall with a record of approximately 1200mm, while the northern portion of the park has significantly less rain with a record of less than 400mm. During the summer, thunderstorms are frequent, and the river often takes on the shape of terrible torrents.