Sai Yok National Park

About Sai Yok National Park

A popular national park for local and foreign tourists, known for its waterfalls, caves, historical sites and raft houses along its main river Khwae Noi. The park covers 958 km² in Sai Yok District of Kanchanaburi Province, the entrance is about 100 km northwest of Kanchanaburi City. The main attractions of the park are; Khwae Noi River, Sai Yok Lek Waterfall, remains of the Death Railway, Dao Wadung Cave, Khang Khao Cave and Lawa Cave.

Sai Yok National Park is part of a huge continuous forest complex called Western Forest Complex, about 18,730 km², comprises 19 protected sites in Myanmar and Thailand.

The mountainous regions of the park are covered with deciduous and dry evergreen forests, mixed with bamboo. The lower areas along the Khwae Noi River are teak forest which was deforested during the Japanese occupation of Thailand but later replanted in 1954. The highest elevation in the park is 1,328 meters asl at the border to Myanmar.

View of morning mist from one of the raft houses in Kwae Noi River

The park is open all year round, even on public holidays. Some caves may be closed during the rainy seasons.

The rainy season is May to October/November with most rainfall around September to October. Rest of the year is quite dry with cooler weather around November to January.


Chances to see some of the interesting animals around the visitor centre area is quite rare because the area is quite commercialised. Water monitors and barking deer are the only interesting animals that can be seen along the river. Most of the interesting animals hold to more remote areas deeper inside the park along the border to Myanmar.

Mammal species found in the park include elephant, gibbon, macaque species, Malayan porcupine, slow loris, serow, barking deer, sambar deer, wild boar and many more. There may be few tigers still roaming in the park.

There are two mammal species in Thailand argued to be the world’s smallest ones. One of them is a rare species of bat called Kitti's hog-nosed bat (Craseonycteris thonglongyai), it can be found in a limestone cave on a convenient walking distance from the visitor centre in Sai Yok. It is named after Kitti Thonglongya who found it for the first time in 1973. These bats are weighing around 2 grams, have 2.5-3 cm body length and up to 10 cm wing-span.

There are around 105 bird species reported from the park. Because the park isn’t really a popular bird destination, likely many more bird species not reported yet.

A quite unique and interesting species known to be only found in Sai Yok National Park is a colorful queen crab species in red, white and blue colors (Thai name; Poo Rachinee).

Of the reptile species, the rare Kanburi pit viper is found in the park. Gecko species like Cnemaspis huaseesom, Cyrtodactylus saiyok, Cyrtodactylus tigroides and Gekko nutaphandi are few gecko species found in the park, all only known to be found in Kanchanaburi area.

Getting there & get around

The visitor centre area is found at the northeast edge of the park 19 km north of Hellfire Pass. The attractions around the visitor centre are smaller waterfalls, springs, trails and few smaller caves. One of the more recommended activities is a visit to Dao Daung Cave.

There are bungalows and raft houses in the park, also tents available for rent at the visitor centre.

Getting to the park

The main visitor centre of the park is about 100 km northwest from Kanchanaburi, 19 km north of Hellfire Pass and 3 km from the highway 323 next to the Kwae Noi River.

Sai Yok National Park is one of the few parks in the country that can relatively easily be reached by public transportation, but not all the way to the park visitor center area. Buses stop by at the highway, the last 3 kilometers into the park can be done by motorcycle taxis. See more details on “Get there & stay” section.

Like in many other popular parks, Sai Yok National Park will get very busy during the week-end and holidays.

Get around in the park

The attractions nearby visitor center area like the smaller caves and the waterfall can be reached by foot via trails, all signposted well and no guide required. Other caves require car/boat/motorbike to get to.

Tours & private transportation

It is possible to book a 2-day tour to Erawan and Sai Yok National Parks with a night stay in one of the raft houses in Sai Yok National Park. For more info, please follow the link below;

Entrance fees & opening times

The entrance fee is 300 Baht for adults and 200 Baht for children. Bikes will be charged with 20 Baht and cars with 30 Baht.

Sai Yok National Park will be closed from 1st July until 30th September every year, otherwise open every day including on holidays and week-ends.

Stay & eat

There are a good number of restaurants and cafes, a campsite, bungalows around the visitor center area. Not too far from the visitor center, there is also a floating rafthouse on the river.


The campsite is spacious, tents and accessories available for rent at the visitor centre from 270 Baht a day. It costs 30 Baht a day to use your own tent in the campground. It is also possible to camp in the jungle when booking a private tour, a much better alternative to camping in the commersialised visitor center area.


There are a good number of bungalows from 4 up to 30 people at the visitor center area. While some of the bungalows are few hundred meters away from the premises, a group of bungalows are a couple of kilometres away. When booking, you are advised to double check at the DNP website which one you are about to book. The price ranges from 800 up to 3,000 Baht, a 20% discount applies when booked for Mon to Thu.

Bungalows can be booked through DNP website in advance. As the money transfer must be done within 2 days and the fact that it takes time with transfers from abroad, it is only possible to book from within Thailand only. Payments can be done at 7-Eleven convenience stores or banks.


Although being inside the national park, the raft houses along Khwae Noi River are all private, some with better quality of stay and definitely better view than the bungalows.


There are many basic restaurants in the visitor center area.


You are recommended to ask a Thai speaking person to call on your behalf.

  • 034 686 024 (Visitor Center)

The attractions of Sai Yok

Campsite & Visitor centre

There are few shorter trails up to 2 km around the visitor centre area leading to caves, remains of the Death Railway Bridge, a natural spring, riverside viewpoints and waterfalls. There is no guide requirement to walk the short trails.

Other trails leads to nearby dirt roads which continues in various directions west.

Kwae Noi River

Kwae Noi is a tributary river to the River Kwai, the main river that runs through the national park on the eastern end of the park. There are several raft houses along the river with good view over the forest. These raft houses are one of the most popular attractions in Kanchanaburi Province. It is possible to hire a long-tail boat for around 400-500 Baht for a half hour trip along the river.

Kwae Noi River

Sai Yok Yai and Sai Yok Lek Waterfalls

Two smaller falls that flows into Kwae Noi River from tributary streams. Sai Yok Yai is right next to the suspension bridge near the visitor centre area, Sai Yok Lek is 300 meters further down-streams. There are viewpoints at the opposite side of each waterfall with relatively good view over them, both accessible by a short stroll from the west side of the suspension bridge. The water flow is best during the rainy season from June/July onward.

Sai Yok Yai Waterfall

Both falls are beautiful but the beauty and the size are too exaggerated on various websites causing some foreign tourists visiting the park getting disappointed once visited.

Sai Yok Noi Waterfall

This limestone waterfall is right outside the national park boundaries, only a couple of kilometres north of Nam Tok Railway Station (Nam tok in Thai means waterfall) which is the end station of the historic "Death Railway" line. This waterfall is really part of Erawan National Park, because name similarity that refers to Sai Yok District, many think it is part of Sai Yok National Park.

Originating from a springs the waterfall flows through forest and cascading over limestone rocks. It is much taller than Sai Yok Yai and Sai Tok Lek Waterfalls, but with less water and no doubt more tourist friendly and more beautiful. The best time of the year to visit is during the rainy season from June/July onwards. The water flow will be less during the dry season but still worth visiting it.

There are regular bus services from Kanchanaburi from 6:45 am until 6 pm, the trip takes about 2 hours. It is also possible to take a train from Kanchanaburi for 17 Baht at 6:11 am, 11:00 am and 4:37 pm, return at 5:25 am 1:00 pm and 3:15 pm. There are plenty of restaurants and shops along the road.


Sai Yok National Park has many caves, only in immediate adjacent of the visitor centre there are 4 smaller caves. Remember to have a flash-light with you to visit the caves.

Dao Wadung Cave

A 240 meters long cave not too far north from the visitor center area, on the west side of the river. The cave is accessible by car/bike from the highway or by a long-tail boat trip 6 km north along the river. The cave is 1.5 km uphill from the nearby ranger station. The cave has 8 chambers consists of rock, stalagmite and stalactite formations. Bat species seen streaming out of this cave before sunset during rainy and cold seasons.

Khang Khao Cave

Accessible by short stroll on a 2 km long trail from the visitor centre area. This is the cave where one of the world's smallest mammal species, the very rare Kitti's hog-nosed bat can be found. This species weighing around 2 grams has a body length around 2.5-3 cm and a wing-span up to 10 cm. The trail to this cave also passes by foundation of Death Railway Bridge.

Lawa Cave

One of the more impressive caves in the national park, 500 meters deep with small entrance but with huge chambers containing large stalactites and stalagmites. This cave is on the west side of the river, easily accessible from a nearby raft house or by long-tail boats from other raft houses along the river. To get there by car, use a bridge nearby rail station 20km south and follow the signs.

More photos

Mixed deciduous forests of Sai Yok National Park