Phu Suan Sai National Park

Open Days: Daily

Opening Hours: 08.00 – 16.30

 

Phu Suan Sai National Park, Loei Province is a mountain national park in Na Haeo District, Loei Province, located along the Thai-Laos border. The park is known for its cool climate, highland forests, misty viewpoints, waterfalls, birdwatching trails, camping areas, dark-sky atmosphere, and dramatic views toward Laos. One of its most distinctive natural landmarks is Hin Si Thit, a group of four large square-shaped sandstone rocks located in the evergreen forest on the southern side of Phu San Sai. The area is an important viewpoint and natural feature of the park, offering views across the mountains and toward the Lao side of the border.

 

Phu Suan Sai is different from many better-known mountain destinations in Thailand because it remains quiet, forested, and remote. The park lies within the uplands of Na Haeo, one of the most peaceful districts of Loei Province. The road to the park passes through rural landscapes, mountain curves, small villages, forested slopes, and border-country scenery. For travelers who prefer nature, mist, birds, mountain air, and a slower pace, Phu Suan Sai offers a deeply rewarding experience.

 

The park was formerly known as Na Haeo National Park. Today, Phu Suan Sai National Park covers parts of Na Haeo, Saeng Pha, and Lao Ko Hok subdistricts in Na Haeo District. The protected area covers around 73,225 rai and includes forested mountains, high ridges, stream valleys, waterfalls, and border viewpoints. Its highest point reaches approximately 1,408 meters above sea level, making some parts of the park cool even when the lowlands are warmer. This elevation is one reason the park is popular for camping, sunrise views, mist, and night-sky observation.

 

The forest in Phu Suan Sai is part of a wider ecological landscape that continues toward Laos. The habitat includes evergreen forest, dry evergreen forest, bamboo forest, and montane forest pockets. These varied habitats support wildlife, birds, reptiles, insects, and plant communities that are adapted to the cooler and more humid conditions of the mountains. Visitors who walk quietly through the forest can sense that the park is not only a scenic destination but also a living ecosystem.

 

Hin Si Thit is one of the park’s most symbolic natural sites. The name refers to four large sandstone blocks with a square-like form, standing in the forest on Phu San Sai. The stones create a strong visual impression because of their regular shape and their location within deep green forest. For Thai visitors, the name also suggests the idea of four directions, making the site feel like a natural marker in the mountain landscape. It is not a casual roadside stop; reaching or visiting the area should be planned with park staff according to current trail conditions.

 

Visitors who wish to see Hin Si Thit should prepare for a nature-based trip rather than a short town-style visit. Trails may pass through evergreen forest, sloped ground, damp soil, and natural terrain that changes with the season. Park staff should be contacted before entering deeper forest routes, especially during the rainy season or when traveling in a group. Proper footwear, drinking water, insect repellent, a flashlight, and weather-appropriate clothing are important.

 

Phu Hua Hom Viewpoint is another major highlight of the park. This area is known for sunrise, sea of mist, mountain layers, and views toward Laos. During the cool season and after rainy days, mist may drift across the valleys, creating a soft and atmospheric landscape. The viewpoint is especially popular among campers and photographers who want to experience the park in the early morning. The air can be cold from evening to morning, so warm clothing is essential.

 

Phu Suan Sai is also known among birdwatchers. The forest around the visitor center and stream areas provides habitat for a variety of mountain and forest birds. A birdwatching trail near the visitor center allows visitors to experience the forest at a manageable distance. Birdwatching here requires silence and patience. Visitors should avoid loud calls, avoid disturbing nests, and observe birds respectfully from a distance.

 

The park has also been recognized as a dark-sky area, making it attractive for night-sky observation and astrophotography. Because the park is far from large urban centers, light pollution is relatively low. On clear nights, visitors may see constellations, star clusters, and a darker night sky than in most towns. Camping at Phu Suan Sai can therefore be meaningful both at sunrise and at night, when the atmosphere becomes quiet and the sky opens above the mountains.

 

Tat Huang Waterfall, also known as the Thai-Laos Friendship Waterfall, is another important attraction within the park. It is located along the border area and is formed by the Huang River. The waterfall is powerful and scenic, especially during the rainy season when the water volume is high. Visitors should stay on the Thai side, follow marked paths, and observe park regulations. The waterfall combines natural beauty with border geography, giving it a special identity within Loei Province.

 

Other waterfalls such as Nam Tok King add more variety to the park’s natural landscape. Waterfalls bring freshness, moisture, and sound to the forest environment. They are most impressive during the rainy season and the transition into the cool season. However, visitors should check trail and water conditions before going, as wet paths, strong currents, and changing weather can affect safety.

 

The visitor center area has essential facilities, including a visitor center, camping grounds, accommodation, toilets, showers, parking, welfare shop, restaurant, first-aid point, and electricity service points. These facilities make it possible for visitors to stay overnight without needing a full wilderness setup. However, the park is still a mountain area far from major towns, so travelers should bring necessary items such as warm clothes, personal medicine, flashlight, snacks, drinking water, and basic camping gear.

 

Camping is one of the best ways to experience Phu Suan Sai. The air becomes cool in the evening, the forest grows quiet, and the morning often brings mist and soft mountain light. Campers should prepare warm sleeping gear, jackets, socks, a headlamp or flashlight, and personal supplies. Those who want to stay in park accommodation or rent tents should contact the park in advance, especially during weekends, public holidays, and the cool season.

 

Phu Khum Khao or the 1,408-meter area is a more demanding route for hikers and campers. This highland area offers mountain views and a more immersive forest experience. Trails in this zone require better physical preparation than short walks near the visitor center. Visitors should arrange ranger guidance and should not attempt remote routes alone. The terrain can be steep, and weather may change quickly in the mountains.

 

Travelers who prefer a lighter trip can stay around the visitor center area, walk the shorter nature trail, visit Phu Hua Hom Viewpoint, or travel to Tat Huang Waterfall when conditions are suitable. This flexibility makes Phu Suan Sai suitable for different travel styles: a short nature visit, a one-night camping trip, a birdwatching trip, a dark-sky photography trip, or a more serious hiking route with staff guidance.

 

The best season to visit is from the late rainy season to the cool season. During this period, the forest is fresh, the weather is comfortable, and the chance of mist is higher. The rainy season is beautiful for waterfalls and green forest but requires caution because trails may become slippery. The hot season is drier, but the higher elevations remain more comfortable than lowland areas. Weather should always be checked before traveling, especially for camping, hiking, waterfalls, and night-sky activities.

 

Responsible travel is important in Phu Suan Sai. Visitors should not leave trash, collect plants, disturb wildlife, feed animals, make loud noise, enter restricted forest areas, or light fires outside permitted areas. The park’s charm depends on its forest, quiet atmosphere, wildlife, and clean mountain environment. Every visitor plays a role in keeping the park natural and safe for future travelers.

 

Getting There is most convenient by private car, rental car, or arranged local transport. From Loei city, travel toward Dan Sai District, then continue to Na Haeo District and Saeng Pha Subdistrict. The distance from Loei city is around 120–128 km. The road includes mountain curves and rural sections, so careful driving is necessary, especially at night, in fog, or after rain. Public transport to the park is limited, so travelers without a vehicle should arrange transport in advance.

 

A 2-day, 1-night itinerary is ideal for Phu Suan Sai. Visitors can arrive in the afternoon, check in at the visitor center or campsite, enjoy the evening atmosphere, observe the night sky, wake early for mist and sunrise, then continue to a waterfall or nature trail. With more time, travelers can include Hin Si Thit, Phu Hua Hom, Tat Huang Waterfall, birdwatching, and nearby cultural attractions in Na Haeo or Dan Sai.

 

Nearby areas can enrich the journey. Na Haeo offers temples, viewpoints, small local communities, and scenic roads. Dan Sai adds cultural depth through Phra That Si Song Rak, Wat Neramit Wipatsana, and Phi Ta Khon cultural heritage. Combining Phu Suan Sai with Na Haeo and Dan Sai creates a trip that includes nature, highland scenery, waterfalls, local culture, and borderland atmosphere.

 

For international travelers, Phu Suan Sai National Park shows a quieter and less commercial side of northeastern Thailand. It is not only a place of forests and waterfalls but also a borderland landscape where mountains, dark skies, birds, mist, and views toward Laos come together. Travelers who enjoy nature, camping, birdwatching, hiking, and peaceful mountain environments will find Phu Suan Sai especially rewarding.

 

In summary, Phu Suan Sai National Park is one of Loei’s most meaningful mountain nature destinations. Its highlights include Hin Si Thit, Phu Hua Hom Viewpoint, the 1,408-meter highland area, Tat Huang Waterfall, Nam Tok King, birdwatching trails, camping areas, park accommodation, and dark-sky conditions. It is a place for travelers who want quiet forests, mountain air, mist, stars, and a deeper connection with the natural landscape of Loei Province.

 

 

A: It is located in Saeng Pha Subdistrict, Na Haeo District, Loei Province, covering parts of Na Haeo, Saeng Pha, and Lao Ko Hok subdistricts.

 

A: Hin Si Thit is a group of four large square-shaped sandstone rocks located in the evergreen forest on the southern side of Phu San Sai. It is an important natural landmark and viewpoint within the park.

 

A: The park is open daily from 08.00 to 16.30. Visitors planning to camp, hike, or enter remote trails should contact the park in advance.

 

A: Thai visitors pay 20 Baht for adults and 10 Baht for children. Foreign visitors pay 100 Baht for adults and 50 Baht for children. The car fee is 30 Baht.

 

A: Yes. The park provides accommodation, camping grounds, toilets, showers, restaurant services, a welfare shop, and basic visitor facilities. Advance contact is recommended.

 

A: It is suitable for nature lovers, campers, birdwatchers, hikers, photographers, stargazers, and travelers who want quiet mountain scenery near the Thai-Laos border.

 

A: Shorter areas near the visitor center may be easier to visit, but Hin Si Thit, the 1,408-meter highland area, remote forest trails, and overnight hiking routes should be arranged with park staff or a ranger.

 

A: Visitors should prepare warm clothing, hiking shoes, flashlight, drinking water, personal medicine, snacks, camera, and should contact the park before camping or hiking in remote areas.