Chaloem Rattanakosin National Park

Chaloem Rattanakosin National Park, also known as Tham Than Lot National Park, is a protected area in Si Sawat District, Kanchanaburi Province, western Thailand. Established on 12 February 1980 to commemorate the 200th anniversary of Rattanakosin (Bangkok) as capital, it covers 59 square kilometers of limestone hills and dry evergreen forest. The park is notable for its extensive cave system, including Than Lot Noi and Than Lot Yai caves, seasonal waterfalls and diverse flora and fauna.

Visitors can expect a compact forested limestone landscape with two main caves, Than Lot Noi and Than Lot Yai, connected by a 2.5 km nature trail through dry evergreen and mixed deciduous forest. The caves feature stalactites, stalagmites, large chambers and an underground stream. The park also has seasonal waterfalls such as Than Lot Noi Waterfall and Trinote Waterfall, viewpoints, camping areas and a visitor centre. Exploration involves walking, stair climbing and guided cave visits.