Thung Yai Naresuan Wildlife Sanctuary (14°55'-15°45'N, 98°28'-99°05'E) is a World Heritage Site situated in the Kanchanaburi and Tak provinces of Thailand alongside the western border with Burma and located at the southern end of the Dawna Range.
Notable bird species include White-winged Wood Duck, Kalij Pheasant, Burmese Peafowl and Green Peafowl
The sanctuary is not open to the general public, but permission may be given to researchers, naturalists and education groups for specific purposes. Some 400-500 visitors come each dry season. Permits can be obtained from the Wildlife Conservation Division in Bangkok, or from the Chief of the Sanctuary. Thung Yai is accessible by road (mostly unsurfaced) from Bangkok via Kanchanaburi. The journey takes 10-12 hours. A four-wheel drive road passes through the sanctuary from the headquarters to a mining concession on the international border.