covers area in three provinces in Uthai Thani, Kanchanaburi and Tak totaling 5,775 square kilometres. The largest continuous tract of wildlife sanctuary in Thailand and in Southeast Asia as well, it features a wide range of natural diversity with both virgin and deciduous forests alternating with grasslands. It is the habitat of diverse plantlife and wildlife, including some near-extinct species. Because of its richness in natural diversity, Thung Yai Naresuan / Huai Kha Khaeng has been registered by UNESCO as a World Natural Heritage Site. As it is a preservation area at least a 15-day advance application is required for study visits and staying overnight. The application is to be submitted to the director of the wildlife preservation unit of the Forestry Department in Bangkok. Areas suitable for study tours are sites around the park office which cover the Khao Hin Daeng Nature Study Route running around the eastern perimeter. To reach the site, proceed from the provincial town along Highway #333 passing Nong Chang district, turning right onto Highway No. 3438 going past Lan Sak district. Then take the turn into Thap Sa-lao Dam at which there is a laterite access road. Continue on for a distance of 11 kilometres to reach the site. Campers must provide their own equipment and provisions and must strictly observe the regulations of the Sanctuary.