Ai Khiao Waterfall (Nai Khiao)

Open Days: Daily

Opening Hours: 08.30 – 16.30

 

Ai Khiao Waterfall, also known locally as Nai Khiao Waterfall, is a large waterfall in Khao Luang National Park, Phrom Khiri District, Nakhon Si Thammarat Province. Located about 30 km from Nakhon Si Thammarat city, it is known for its clear mountain stream, green moss-covered rocks, natural pools, humid rainforest, and a short nature trail along the stream. It is a strong choice for travelers who want a nature-focused day trip close to the city.

 

Ai Khiao Waterfall, or Nai Khiao Waterfall, is one of the most attractive natural destinations in Nakhon Si Thammarat. It is located in Thon Hong Subdistrict, Phrom Khiri District, within Khao Luang National Park. The waterfall is especially memorable because of its fresh stream from Khao Luang, the dense evergreen forest around it, and the green tone of the rocks created by moss, algae, and small moisture-loving plants. This natural green character gives the waterfall a distinctive identity among the waterfalls of Phrom Khiri.

 

The waterfall is not far from Nakhon Si Thammarat city and can be reached on the same main route used for Phrom Lok Waterfall. Travelers take Highway 4016 from Nakhon Si Thammarat toward Phrom Khiri, continue to around the 24 km marker, then turn left into the road leading to Ai Khiao Waterfall for about 5 km. The approach route passes local communities, orchards, rubber plantations, betel-leaf gardens, and foothill scenery, giving visitors a clear sense of the rural landscape around Khao Luang.

 

The water source of Ai Khiao Waterfall comes from Khao Luang and the rich watershed forest of Khao Luang National Park. The stream descends along the mountain slope through boulders, rock terraces, and many natural pools. Several waterfall tiers are mentioned in local travel information, including Nan Chong Sai, Nan Bang Bai, Nan Mai Phai, Nan Suea Phan, Nan Buppha Sawan, Nan Hin Kong, Nan Hua Chang, Nan Sai Kwat Lan, and Nan Fa Faed. These names reflect the physical character of the landscape, the plants around the stream, or local descriptions connected to each part of the waterfall.

 

The name Ai Khiao is closely connected to the visual character of the area. The streambed and rocks are often covered with green moss, algae, and small plants. When clear water flows over these surfaces, the whole waterfall area takes on a fresh green appearance. The local name Nai Khiao also reinforces the feeling of entering a green world inside the forest. For foreign travelers, this makes Ai Khiao Waterfall an appealing place to experience the rainforest side of southern Thailand without needing a long jungle trek.

 

Ai Khiao Waterfall has a different atmosphere from nearby Phrom Lok Waterfall. Phrom Lok is well known for broad rock terraces and accessible pools, while Ai Khiao feels more enclosed by forest and has a stronger nature-trail character. The walking route along the stream is short but rich in detail, with rocks, water, ferns, mosses, and humid forest plants appearing throughout the path. This makes the waterfall suitable not only for relaxing by the water but also for observing the ecology of a southern Thai rainforest stream.

 

The nature trail at Ai Khiao Waterfall is one of its most valuable features. It follows an out-and-back route of about 500 meters and takes around 30 minutes to walk at an easy pace. The trail moves gently up and down through a rock garden beside the stream. Along the way, visitors may see rainforest plants such as tree ferns, ferns, mosses, lichens, air plants, orchids, rattan, forest betel, and other shade-loving species. The area is also associated with small forest animals and amphibians adapted to moist environments, making the trail an accessible outdoor classroom for nature lovers.

 

The surrounding forest remains dense and shaded. As visitors walk deeper into the waterfall area, the air becomes cooler, the sound of water becomes clearer, and the moisture of the rainforest becomes more noticeable. The site is especially good for travelers who enjoy photography, as the waterfall offers many natural compositions: white water over green rocks, sunlight filtering through the forest canopy, small pools, wet boulders, and lush vegetation along the stream.

 

The lower area of the waterfall is the most popular part for general visitors because it is easier to reach and has natural pools suitable for relaxing in permitted areas. Families and groups of friends often spend time around the lower stream, sitting near the water, resting on rock terraces, or cooling off in safe spots. Even so, visitors should only enter areas allowed by park staff and avoid deep pools, fast-flowing water, restricted sections, and slippery rock surfaces.

 

The best time to visit depends on the kind of experience travelers want. During the rainy season and shortly after rainfall, the waterfall carries more water and appears more powerful, with white streams flowing over the high rock sections. This is a beautiful time for photography, but visitors must pay close attention to safety. During periods without heavy rain, the water is usually clearer and calmer, making the lower pools better for relaxed water activities. Morning to early afternoon is the best time to visit because travelers have enough time to enjoy the trail and leave before the park closes.

 

Ai Khiao Waterfall is also a good viewpoint area for appreciating Khao Luang, one of the most important mountains in southern Thailand. Khao Luang is the heart of the national park and an essential watershed for many streams and communities in Nakhon Si Thammarat. Seeing the mountain landscape from the waterfall area helps travelers understand why this province has so many waterfalls, orchards, streams, and fertile green valleys.

 

The road to Ai Khiao Waterfall also reveals part of the local identity of Phrom Khiri. One notable feature is the betel-leaf gardens along the route. Local people refer to this betel as phlu pak hram, a fragrant and spicy betel associated with the agricultural culture of Nakhon Si Thammarat. For travelers, this adds a cultural layer to the visit. The journey to the waterfall is not just a transfer from the city to a natural attraction, but a short passage through the local farming landscape of Phrom Khiri.

 

Travelers should prepare practical items before visiting Ai Khiao Waterfall. Shoes with good grip are important because rocks can be very slippery. Quick-drying clothes, a towel, waterproof phone protection, mosquito repellent, drinking water, and a bag for carrying trash back out of the park are also useful. Visitors who plan to walk beyond the lower area should speak with park staff first and begin early in the day. Walking deep into the forest without route information is not recommended.

 

The main safety concern at Ai Khiao Waterfall is sudden water flow and slippery rocks. Southern Thai waterfalls are affected by mountain rainfall. If heavy rain occurs upstream, water levels can rise quickly even when it is not raining at the lower waterfall area. Visitors should watch the color and speed of the water, listen to staff instructions, and leave the stream immediately if the water becomes muddy, stronger, or carries branches and debris.

 

Responsible travel is essential because Ai Khiao Waterfall is part of a national park and a natural watershed. Visitors should avoid leaving food waste, foam containers, plastic bags, or other trash in the forest. Nothing should be thrown into the stream. The clean water and healthy forest are the main reasons people come here, and protecting them helps both wildlife and the communities downstream.

 

Ai Khiao Waterfall can be combined with other nearby attractions in a half-day or full-day route. Phrom Lok Waterfall is close and lies on the same general travel corridor. Wat Khao Khun Phanom, Wang Pla Ngae, and other local nature spots in Phrom Khiri can also be added depending on available time. Travelers with a full day may continue to Nakhon Si Thammarat city for Wat Phra Mahathat Woramahawihan or explore broader Khao Luang-related routes such as Kiriwong Village and Krung Ching Waterfall on a separate itinerary.

 

Getting There from Nakhon Si Thammarat city is straightforward by private car, rental car, or hired local transport. Take Highway 4016 toward Phrom Khiri, using the same main route as Phrom Lok Waterfall. Continue to around the 24 km marker, then turn left into the waterfall access road and drive for about 5 km. Travelers without their own vehicle should arrange a rental car or hired transport from the city or airport, as public transport directly to the waterfall entrance is less convenient.

 

Ai Khiao Waterfall is well suited for travelers looking for a natural attraction near Nakhon Si Thammarat city that still feels deeply connected to the forest. It offers cool water, green rocks, rainforest plants, a short nature trail, local agricultural scenery, and a close view of the Khao Luang mountain landscape. For those who want to see the green and refreshing side of Nakhon Si Thammarat, this waterfall deserves a place in a Phrom Khiri travel plan.

 

 

A: Ai Khiao Waterfall is located within Khao Luang National Park in Thon Hong Subdistrict, Phrom Khiri District, Nakhon Si Thammarat Province.

 

A: The waterfall is open daily from 08.30 to 16.30.

 

A: Yes. The national park entrance fee is 40 baht for Thai adults, 20 baht for Thai children, 200 baht for foreign adults, and 100 baht for foreign children, with additional vehicle fees by vehicle type.

 

A: Visitors can enjoy the water in permitted areas, but they should avoid swimming when the water is muddy, fast-flowing, after heavy rain, or around slippery rocks.

 

A: Its highlights include the Khao Luang mountain stream, green moss-covered rocks, humid rainforest, natural pools, and a short nature trail along the stream.

 

A: The rainy season and the period after rainfall make the waterfall more powerful, while lighter rain periods usually provide clearer water and a calmer setting for relaxing by the stream.

 

A: Take Highway 4016 toward Phrom Khiri, continue to around the 24 km marker, then turn left into the waterfall access road and drive about 5 km.

 

A: Nearby places include Phrom Lok Waterfall, Wang Lung Waterfall, Phra Tamnak Mueang Nakhon, Wat Khao Khun Phanom, and Wang Pla Ngae.