Ton Sak Yai National Park (Thai: อุทยานแห่งชาติต้นสักใหญ่, RTGS: Utthayan Haeng Chat Ton Sak Yai) is a national park in Nam Pat, Tha Pla, Thong Saen Khan and Mueang Uttaradit districts in Uttaradit Province, Thailand, it was formerly known as Khlong Tron National Park.Ton Sak Yai National Park is located about 90 kilometres (56 mi) east of Uttaradit town in Nam Pat, Pak Huay Chalong, Huay Sisead, Khlong Tron Fang Khwa and Khlong Tron Fang Say forests in Uttaradit province.[3] The park's area is 324,240 rai ~ 519 square kilometres (200 sq mi)[5] and neighbouring Lam Nam Nan National Park and Nam Pat Wildlife Sanctuary to the north, abutting Phu Miang-Phu Thong Wildlife Sanctuary to the east and neighbouring Khao Yai-Khao Na Pha Thong & Khao Ta Phrom non-hunting area to the west.Winter or northeast mansoon season, with cold weather from October until February.On December 4, 2003, Khlong Tron National Park, covering an area of 519 km2 (200 sq mi) was declared the 103rd national park and managed by Protected Areas Regional Office 11 (Phitsanulok).
Indochinese roller
10) Ton Sak Yai National Park in overview PARO 11 (Phitsanulok)