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Thung Yai Naresuan – Huai Kha Khaeng Wildlife Sanctuary
has begun to be known since it was registered as a World Heritage Site by UNESCO in December 1991.
Huai Kha Khaeng has an area of 3,609,375 rai or 5,775 square kilometres, covering an area of 6 districts of 3 provinces: Amphoe Ban Rai, Amphoe Lan Sak, and Amphoe Huai Khot in Uthai Thani; Amphoe Sangkhla Buri and Amphoe Thong Pha Phum in Kanchanaburi; and Amphoe Umphang in Tak. It also includes the area of Thung Yai Naresuan Wildlife Sanctuary, so this is the largest connected conserved forest in Thailand and the South East Asia Region.
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