Chitwan National Park stands today as a successful testimony of nature conservation in South Asia. This is the first national park of Nepal established in 1973 to preserve a unique ecosystem significantly valuable to the whole world. The park covering a pristine area of 932 sq. km is situated in the subtropical inner Terai lowlands of southern central part of Nepal.
The park has gained much wider recognition in the world when UNESCO included this area on the list of World Heritage Site in 1984. The park consists of churia hills, ox-bow lakes, flood plains of Rapti, Reu and Narayani rivers. The Churia hill rises gradually towards the east from 150 m to over 800 m. The lower but most rugged Someshwor hills occupy most of the western portion of the park. The flood plains of Chitwan are rich alluvial. The park boundaries have been delineated by the Narayani and Rapti rivers in the north and west, and the Reu river and Someshwor hills in the south and south-west. It shares its eastern border with Parsa Wildlife Reserve. The Chitwan valley is characterized by tropical to subtropical forest. 70% of park vegetation is predominantly Sal ( Shorea robusta ) forest, a moist deciduous climax vegetation type of the Terai region. The remaining vegetation types include grassland (20%), riverine forest (7%) and Sal with Chirpine ( Pinus roxburghii ) (3%), the latter occurring at the top of the Churia range. The riverine forests mainly consists of khair, sissoo and simal. The simal is with spiny bark when young and develops buttress at the bottom in older stage. The grasslands form a diverse and complex community with over 50 species. The Sacchrum species, often called elephant-grass can reach 8 m in height. The shorter grasses such as Imperata is useful for thatch roofs.
There are more than 43 species of mammals in the park. The park is especially renowned for its protection of the endangered one- horned rhinoceros, tiger, and gharial crocodile along with many other common species of wild animal.
The estimated population of rhinos is 400. The park also secures populations of endangered species such as gaur, wild elephant, four horned antelope, striped hyena, pangolin, Gangetic dolphin, monitor lizard, and python. Some of the other animals found in the park are sambar, chital, hog deer, barking deer, sloth deer, common leopard, ratel, palm civet, wild dog, langur and rhesus monkeys. There are over 450 species of birds in the park. Among the endangered birds are the Bengal florican, giant hornbill, lesser florican, black stork and white stork. A few of the common birds seen are peafowl, red jungle fowl, and different species of egrets, herons, kingfishers, flycatchers and woodpeckers. The best times for bird watching are in March and December. More than 45 species of amphibians and reptiles are found in the park, some of which are the marsh mugger crocodile, cobra, green pit viper and various species of frogs and tortoises. The park is actively engaged in the scientific study of several species of wild flora and fauna.