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Tham Huai Poen data from Internet  ,  , Thai Back-Link Neighborhood: 
paths of length <= 2 sorted in chronological order - data from Internet  , Underground Cavity Back-Link Neighborhood: 
paths of length <= 2 sorted in chronological order Create instance of  Underground Cavity <https://ontology.uis-speleo.org/ontology/#UndergroundCavity> - data from Internet  , d93019be400725b5eb122da4e6f26952 Back-Link Neighborhood: 
paths of length <= 2 sorted in chronological order - data from Internet  , 467 data from Internet  , TH data from Internet  , This cave is in the same doline as Tham Nam Tok Nam Poen, but is a different stream sink. From the Security Development Project headquarters take the sealed road south (not the road that goes back down to Chiang Klang). As this road turns north take a dirt road south. Drive past the National Park ranger station to a Y junction. Take the left hand fork, turning right at another Y junction, and drive down the rough track into the Nam Poen doline. The track ends at a pond and some farm buildings. Walk northwards along the edge of the cabbage field to the end. From here it is a short descent into the dry stream bed. Follow the stream bed north for about 100 m to the large rift entrance. data from Internet  , Martin Ellis data from Internet  , EN data from Internet  , 19.39834965497197 data from Internet  , NA0069 data from Internet  , The seasonal stream sinks into an impressive rift entrance 5m wide and 70m deep which requires four rebelays to allow a safe descent. At the foot of the shaft the passage continues to descend with a 4m climb followed by an inclined 8m pitch and then a vertical 6m pitch into a large boulder floored passage which descends steeply before leveling out at a mud choked sump. Just back from the choked sump a draughting crawl on the right leads over mud and then sand before opening out into an active streamway. The stream enters via a waterfall from a chamber with loose boulders that was not fully explored. Heading downstream the stream drops down a series of cascades and through a couple of pools before reaching a sump at a depth of -175m. data from Internet  , 175 data from Internet  , Martin Ellis data from Internet  , 1350 data from Internet  , 2844 data from Internet  , 101.08143533629918 data from Internet  , EN data from Internet  ,  ,