Update : 9/6/2026

ภาษาไทย

Tham Than Lod Noi

(Chaloem Rattanakosin National Park)
Si Sawat District, Kanchanaburi

The Majestic River-Tunnel Cave and Enchanting Forest Trails Located inside the lush Chaloem Rattanakosin National Park, Tham Than Lod Noi is a breathtaking natural wonder defined by a sparkling stream flowing directly through a massive limestone cavern.

The cave itself is about 300 meters long, with a wide, dramatic entrance measuring 25 meters wide and 10 meters high. The continuous flowing water keeps the cave wonderfully cool and breezy year-round. Inside, exploration is safe and easy, fully equipped with a secure concrete walkway stretching from the entrance to the exit, and a well-designed interior lighting system that showcases the striking formations of ancient stalactites, stalagmites, pillars, and stone curtains.

Unique Cave Wildlife & The Icon of the Park

The cave is home to a unique ecosystem, including the Tosakanth Leaf-Nosed Bat, barb fish, and rasbora fish. Keep your ears open for the park’s most famous resident: the “Jong Khrong” (Barking Frog or Water Dog). This rare, giant toad species is the official symbol of the national park and is known for making a distinctive barking sound that echoes through the forest just like a dog!

An easy 200-meter walk from the parking lot to the entrance of Tham Than Lod Noi.
The park’s welfare shop located near the cave entrance, offering delicious and budget-friendly meals, snacks, and drinks.
Clearly marked information boards and signs placed at multiple spots.
The grand entrance of Tham Than Lod Noi Cave.
The grand entrance of Tham Than Lod Noi Cave.
Looking back toward the light from inside the cave entrance.
Still capturing the entrance area, but exploring a fresh, scenic angle for you.
The breathtaking interior is wonderfully cool and airy, with a continuous natural breeze and no musty odors.
The well-lit concrete walkway stretches over a total distance of 300 meters.
he absolute highlight: a massive and majestic stalactite formation. What shapes can your imagination discover here?
Stepping slightly off the concrete path near the cave exit to capture this stunning perspective.
The exit of Tham Than Lod Noi. To continue to Tham Than Lod Yai, it is a 2.5 km trek. Tips: Start before 01:00 PM (3 hours round-trip). The trail is steep and slippery in sections; sneakers/hiking shoes and plenty of drinking water are highly recommended.
The official symbol of the national park: the rare “Jong Khrong” (Barking Frog), famous for its unique dog-like barking call.

National Park Jungle Trekking Routes

Spanning over 36,875 rai of pristine forest, Chaloem Rattanakosin National Park offers two excellent hiking trails starting from the park headquarters:

  • Route 1: The Cave-to-Cave Adventure (Tham Than Lod Noi to Tham Than Lod Mega Cave)
    • Distance: 2.5 kilometers (Approx. 3 hours round-trip)
    • The Trail: Start by walking through the illuminated Tham Than Lod Noi cave along the Lam Kraphroi stream. Once you exit the cave, a 1.5-kilometer jungle trail leads you to Trai Trueng Waterfall. From there, hike another 1 kilometer up the mountain to reach the jaw-dropping Tham Than Lod Yai, a massive natural stone archway.
    • Safety Note: It is highly recommended to start this trek no later than 01:00 PM to ensure you return before nightfall.
  • Route 2: The Waterfall Trail
    • Distance: 1.8 kilometers
    • The Trail: A scenic forest hike leading directly to two beautiful, cascading waterfalls: Than Ngoen Waterfall and Than Thong Waterfall.
    • Other Park Highlights: Don’t miss the fun Slider Waterfall located nearby within the park property.

Visitor Information

  • Opening Hours: 08:30 AM – 04:30 PM (Open Daily)

  • Proximity: The entrance to Tham Than Lod Noi is just an easy 200-meter walk from the main park parking lot.

  • National Park Admission Fees:

    • Foreigners: Adults 300 THB / Children (Ages 3–14) 150 THB (Note: Adjusted to standard national park rates for accuracy)

    • Thai Citizens: Adults 40 THB / Children (Ages 3–14) 20 THB

    • Vehicle Entry Fee: 30 THB per car

Contact & Bookings

  • Chaloem Rattanakosin National Park Headquarters: +66 34 547 020 / +66 95 619 8981

  • National Park Accommodation & Campsite Bookings: +66 2 562 0760

  • TAT (Tourism Authority of Thailand) Kanchanaburi: +66 34 511 200 / +66 34 512 800

Map

(Chaloem Rattanakosin National Park)
Si Sawat District, Kanchanaburi

 

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