Commonly known among locals at Tham Than Lot Nation Park, this 54-square-kilometre national park embraces verdant forest, rare wildlife animals, waterfalls, and several caves including main attractions such as Than Lot Noiand Than Lot Yai caves, which are accessible through a 2.5-kilometer nature trail along the stream. The two caves are naturally decorated with spectacular stalactites and stalagmites one of which is the worlds tallest stalagmite pillar. The ideal time of the year to visit the caves is from February to April. It is recommended that you request the services of a park ranger as your guide. Accommodation and camping ground are available.