Bardiya is famous for Bardia National Park which is the largest and most undisturbed national park in Nepal. About 70% of the park is covered with forest, with the balance a mixture of grassland, savannah, and riverine forest. The flora recorded in the park comprises 839 species of flora, including 173 vascular plant species comprising 140 dicots, 26 monocots, six fern, and one gymnosperm species.
The wide range of vegetation types in forest and grassland provides excellent habitat for 642 faunal species. Bardia National Park is home to at least 53 mammals including rhinoceros, wild elephants, Bengal tigers, swamp deer, and Gangetic dolphins. Current checklists include 407 bird species, among them the Bengal florican, white-rumped vulture, peafowl, and bar-headed geese, which are symbolic of the park. Lesser florican and sarus crane are present; Grey-crowned Prinia, jungle Prinia, pale-footed bush warbler, aberrant bush warbler, striated grassbird, golden-headed cisticola, and chestnut-capped babbler occur in the park's grasslands.