The Sai Yok National Park is situated within Amphoe Thong Pha Phum and Amphoe Sai Yok districts. On the west it is bordering with Myanmar (Burma). It became a National Park in 1980, with a total area of 500 km². The area is mountainous, mostly limestone mountains which run on north-south axis. King Rama V used to visit this place and take a bath in a stream. The mountains and hills are covered by mixed deciduous and dry evergreen forest with bamboo forest. There is a teak forest along the Kwae river side. Wildlife seen in the park includes bull, red cow, tiger, wild pig, samba deer, barking deer and birds. Khun Kitti Bat (probably the world smallest bat) and Poo Rachinee (Queen Crab) are also found.
Sai Yok Noi Waterfall
This waterfall is located about 2 km from Nam Tok Train Station and about 60 km from Kanchanaburi on highway 323 to Sangkhlaburi. Its landscape is one of the most beautiful places in Thailand where once the Death Railway was passing Sai Yok Noi. The best time to visit: during rainy season (July – October).
Sai Yok Yai Waterfall
The Sai Yok Yai Waterfall is part of Sai Yok National Park. The falls are about 100 km from Kanchanaburi on highway 323. It is famous for its idyllic beauty which was once visited by King Rama V. The falls are widely celebrated in Thai poetry and songs. The falls flows from cliffs into Kwai Noi River. The park entrance is about 38 km north of Sai Yok Noi Falls, but the falls are hidden 3 km off the main road. You can go there by motorbike or bus. Bus travellers should get off at the national park sign, then flag down a passing car or face a long and dusty walk. Motorcycle taxis may be available.