About Tham Than Lot Caves
Tham Than Lot Caves are a pair of limestone caves, Than Lot Noi and Than Lot Yai, located in Chaloem Rattanakosin National Park in Si Sawat District, Kanchanaburi Province, western Thailand. A forest stream flows through both caves, creating stalactites, stalagmites and large chambers. Notable for its karst geology, accessible nature trail and relatively undeveloped setting, the site is a key attraction of Thailand's 17th national park.
Visitors guide
Visitors can expect a forested national park setting with a marked nature trail leading to two large limestone caves connected by a shallow stream. Inside, there are spacious chambers with stalactites, stalagmites, columns and draperies, dark passages requiring a flashlight, and a stream flowing through the cave floor. The trail passes through dry evergreen forest, with boardwalks and steps in places, and park guides are available to lead cave exploration.
Key highlights
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Two main caves - Than Lot Noi (small) and Than Lot Yai (large) connected by a stream
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Active stream flowing through the cave system with wading sections
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Limestone formations including stalactites, stalagmites and large chambers
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Forest nature trail (approx. 2.5 km) through Chaloem Rattanakosin National Park
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Relatively undeveloped and quiet cave experience with park guide service
History of Tham Than Lot Caves
Natural limestone cave system formed by water erosion over millions of years; located within Chaloem Rattanakosin National Park, established in 1980 as Thailand's 17th national park to protect the karst landscape, forest and cave systems of Si Sawat
Culture & Context
Valued as a natural heritage and eco-tourism site showcasing Kanchanaburi's karst geology; used for nature education, conservation awareness and low-impact recreation within the national park system
Route
| By air | No airport in Si Sawat; fly to Bangkok Suvarnabhumi Airport (BKK) or Don Mueang Airport (DMK), then travel by road/rail to Kanchanaburi and Si Sawat |
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