Katarniaghat Wildlife Sanctuary is a part of the Dudhwa Tiger Reserve. It is managed along with the Dudhwa National Park and Kishanpur Wildlife Sanctuary. The Katarniaghat Forests provide strategic connectivity between tiger habitats of Dudhwa and Kishanpur in India and the Bardia National Park in Nepal.
The Gairwa river which flows in the sanctuary area is declared as a sanctuary for Mugger and Gharial. It is also home to rare turtles, freshwater fish and a host of aquatic life. The river presents a scenic view on both banks with long forest tracts running into the distance and overhanging trees on the river bank creating coves that attract visitors on motorboats. The sanctuary has a mosaic of Sal and Teak forests, lush grasslands, numerous swamps, and wetlands.