Tham Nam Khao Siwa

Rating: 3.5/5 (4 votes)

Open Days: Open daily (advance contact with a local guide recommended)

Opening Hours: 08:00–16:00

 

Tham Nam Khao Siwa is located amid the complex ridgelines between the Tang Ok Mountain Range and the Kok Mamuang Mountain Range in Khlong Hat District, Sa Kaeo Province. The surrounding area is a quiet rural landscape filled with open forests, limestone hills, farmlands, and small villages. As soon as visitors arrive at the cave entrance, they will feel the cool, moist air produced by the stream of water flowing out of the cave all year round. It is as if the mountain itself breathes continuously, giving the entire cave a sense of life and movement that distinguishes it from most caves in eastern Thailand.

 

Tham Nam Khao Siwa is a natural limestone cave stretching approximately 500 meters deep. The entire route inside is filled with water of varying depths, from ankle-deep sections to areas reaching chest level, ranging roughly from 10–220 centimeters. Exploring the cave requires wading, floating, and in some sections, swimming. Its flowing water never runs dry, fed by underground springs circulating beneath the mountain throughout the year. This steady circulation keeps the air inside fresh, well-ventilated, and pleasantly cool, with the rhythmic sound of water echoing gently along the stone walls.

 

As visitors progress further into the cave, natural light gradually fades. When waterproof flashlights illuminate the rock formations, the hidden beauty of the cave comes alive. Some formations resemble golden curtains formed by mineral deposits over thousands of years. Others take on shapes that resemble mythical animals or mysterious symbols. When light reflects off mineral particles and tiny water droplets, the entire chamber sparkles like a night sky full of stars. This rare and breathtaking sight is part of what makes Tham Nam Khao Siwa one of the most enchanting adventure caves in eastern Thailand.

 

The journey inside follows a continuous watercourse requiring confidence and awareness. The first section is shallow, with mist from the water cooling the rock walls. The middle portion grows deeper, requiring visitors to float or swim, especially around winding passages where they must hold onto rocks or guide ropes. Most visitors spend around 1–2 hours traveling from the entrance to the end chamber, where large stalactites glow with a soft golden reflection, resembling a frozen waterfall illuminated by light—a final scene that is both thrilling and deeply memorable.

 

Although the route is adventurous, Tham Nam Khao Siwa is safe when visitors follow the instructions of registered guides and use proper equipment. Basic swimming skills are essential. Wearing life jackets or using floatation rings is required at all times. During the rainy season, water levels must be carefully assessed, as sudden rises can occur. Local guides are experienced in determining the safest times to enter, often coordinating with the Khlong Kai Thueng Subdistrict Administrative Organization for daily safety updates.

 

Recommended equipment includes lightweight clothing that does not retain water, sturdy sandals or water shoes, waterproof headlamps, hurricane lanterns for large groups, spare lighters, waterproof bags for devices, water-resistant cameras, and small inflatable rafts for deep sections. Being well-prepared ensures a safer and smoother experience, especially for families or groups of friends.

 

The charm of Tham Nam Khao Siwa extends beyond the cave itself. The surrounding hills and open forests create a refreshing environment with cool breezes. Birds and the sound of running water enhance the natural tranquility. The nearby village of Ban Khao Chan Daeng maintains its traditional rural lifestyle. Locals are familiar with visitors and warmly welcome those who come for cave exploration. A trip here is not only an adventurous journey underground but also an opportunity to experience the peaceful rhythm of a community closely linked with nature.

 

Getting There is relatively straightforward despite the rural road sections. From Sa Kaeo city, follow Highway 317 and turn left onto Highway 3067. After passing alternating areas of farmland and villages, continue until reaching Highway 3395. Drive for approximately 15 kilometers to a major three-way junction, then turn left and continue for another 3 kilometers to the cave entrance. For travelers coming from Wang Nam Yen District, follow the route to Khlong Hat for 47 kilometers, turn left into the district center, continue toward Ban Khao Chan Daeng for 16.7 kilometers, then turn left toward Khao Tang Ok and drive another 18 kilometers. The final stretch is slightly winding but accessible by standard cars. During the rainy season, vehicles with higher ground clearance are recommended.

 

Morning to early afternoon is the best time to visit Tham Nam Khao Siwa, as gentle natural light reaches the cave entrance. Even though interior sections remain dark, daylight helps visibility during preparation. Late-day visits are not recommended due to difficulty assessing water levels. During the dry season, water inside the cave is clear and calm. During late rainy to early cool season, the water becomes colder and deeper, requiring guides to evaluate conditions more frequently. Following guide instructions is essential for a safe and enjoyable adventure.

 

A trip to Tham Nam Khao Siwa is more than just a cave visit. It is an immersive experience that heightens every sense—hearing the echo of flowing water, seeing sparkling minerals in perfect darkness, and feeling the peaceful stillness beneath a mountain. For nature lovers, adventure seekers, or anyone wishing to step beyond their comfort zone to discover a hidden beauty, this cave offers an unforgettable journey.

 

 

A: It is generally safe when visitors follow guide instructions and use flotation devices at all times. During the rainy season, water levels must be assessed carefully.

 

A: Non-absorbent clothing, sturdy water shoes, waterproof flashlight, life jacket or floatation ring, waterproof bag for belongings, and a small inflatable raft.

 

A: Yes, if they can swim and are closely supervised. Guides will help assess suitability.

 

A: Approximately 1–2 hours, depending on water levels and group size.

 

A: Yes, contacting the Khlong Kai Thueng Subdistrict Office beforehand is recommended to confirm water levels and guide availability.

 

A: Late summer to early rainy season offers the clearest and most stable water conditions, while heavy rainy periods should be avoided due to potential water level surges.