Ai Khiao Waterfall also known as Nai Khiao Waterfall, is a hidden gem of the Khao Luang mountain range that still preserves an exceptional level of natural integrity. The name “Ai Khiao” comes from the vivid green rocks along the stream, covered with thick layers of moss and algae, creating a lush green landscape throughout the area. Originating from Khao Luang Peak, the highest mountain in southern Thailand, the waterfall maintains a strong and steady flow of crystal-clear water all year round, even during the dry season.

The waterfall consists of more than 15 tiers, each offering a unique character and beauty, such as Nan Chong Lom, Nan Bang Bai, and Nan Roi Kon. Most visitors prefer to relax and swim at the lower levels, which are easy to access and feature relatively safe natural pools. For adventure seekers, hiking further upstream reveals higher tiers with a more secluded atmosphere and breathtaking scenery.

The trail leading to the waterfall is shaded by dense tropical rainforest, with towering trees providing cool shade throughout the day. The air here is fresh, humid, and refreshing, making it an ideal place for relaxation and nature therapy. In the past, the surrounding area was an important betel nut and fruit-growing zone for the Phrom Khiri community, traces of which can still be seen today.

The wide rock terraces in front of the waterfall are popular photo spots, especially when sunlight filters through the forest canopy and reflects off the white flowing water against emerald-green rocks. The exceptional clarity of the water allows visitors to spot mahseer fish swimming in the pools, highlighting the health of the ecosystem. Park rangers strictly maintain cleanliness and safety, ensuring that Ai Khiao Waterfall remains pristine and welcoming.

Ai Khiao Waterfall perfectly balances dramatic natural beauty with convenient access, making it suitable for families, photographers, and nature lovers alike. If you are looking for a majestic yet peaceful waterfall in Phrom Khiri, this destination should not be missed. The memories of clear water and endless greenery will surely draw you back again and again.

• By Private Car: From Nakhon Si Thammarat city, take Highway No. 4016 (Nakhon Si Thammarat–Phrom Khiri) toward Thon Hong Subdistrict. Look for the sign to “Ai Khiao Waterfall” on the left, then turn onto the paved road and continue for approximately 3–4 kilometers to reach the park entrance.

• By Public Transport: Take a local minibus or songthaew from Nakhon Si Thammarat to Nopphitam or Thon Hong. Get off at the entrance junction to Ai Khiao Waterfall, then hire a motorcycle taxi to reach the waterfall area.

• Lower-level pools are suitable for swimming, but be cautious of slippery rocks covered with moss.ฃ

• Inform park staff and start early if you plan to hike to higher tiers.

• Wear non-slip footwear and bring insect repellent if exploring deeper areas.

• As this is a national park, avoid single-use plastics and take all trash back with you.

• Weekdays are quiet and ideal for photography and peaceful relaxation.

Entrance Fee:

Khao Luang National Park admission fee

• Thai nationals: Adults 40 THB / Children 20 THB

• Foreign visitors: Adults 200 THB / Children 100 THB

Opening Hours:

• Open daily from 08:30 AM – 04:30 PM.