Si Satchanalai Historical Park is located on the bank of the Yom River. It is open daily between 8.30 a.m.-4.30 p.m. Admission is 40 baht.

This exquisite national park with a combined natural and historical background covers an area of 341 square kilometres, and was declared to be a national park on October 27, 1980. High hills and steep cliffs some over 1,200 metres above sea level, together with fascinating falls, different species to plants and wildlife are some of the major attractions available in this park offered to nature loving tourists or visitors. Furthermore, the archaeological and historical sites with ancient remains and relics make the park even more attractive, especially for critics and theologians. To reach the park by road, take Highway No.1 from Bangkok, then at km.414 (20 kilometres to Sukhothai) take the left turn along the laterite road for another 16 kilometres till arriving at the parks office. For accommodation, reservations for bungalows and tents can be made through the National Park Section, the Royal Forest Department by Tel: 0 2562 0760 or P.O.Box 1 Amphoe Khiri Mat, Sukhothai 64160 www.dnp.go.th Visitors have to start trekking before 3.30 a.m. everyday and bring food and essential equipment with them. Bungalows and tents are available. Admission is 200 baht per person.

Thailand's largest earthen dam is a significant structure built as part of the Nan River Development Project. Initially named "Pha Som Dam," it was later renamed in honour of Queen Sirikit following royal permission. The dam stands as a testament to Thailand's advancement in water resource management and engineering.