The Thungyai Naresuan Wildlife Sanctuary เขตรักษาพันธุ์สัตว์ป่าทุ่งใหญ่นเรศวร and Huai Kha Khaeng Wildlife Sanctuary ขตรักษาพันธุ์สัตว์ป่าห้วยขาแข้ง are adjacent parks in the Uthai Thani, Kanchanaburi and Tak provinces of Western Thailand. At 622,200 hectares combined, they form the largest protected area in Southeast Asia, and were listed as a UNESCO World Heritage Site in 1991. They are best visited from Uthai Thani.
