The Wildlife Sanctuary Thung Yai Naresuan (Thai: เขตรักษาพันธุ์สัตว์ป่าทุ่งใหญ่นเรศวร) is a protected area in Thailand in the northern part of Kanchanaburi province and the southern part of Tak province. It was created as a Wildlife Sanctuary on April 24, 1974 and was declared a World Heritage Site by the UNESCO in 1991 together with the adjoining Huai Kha Khaeng Wildlife Sanctuary.[1]