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Epiphreatic caves develop close to the water table at the boundary between vadose and phreatic karst zones. The recognition of their former existence and position in uplifted limestone regions can inform on phases of uplift, base level lowering and rate of vertical deepening of the karst. Hence, epiphreatic caves and the karst processes that form them are of specific interest. Although the large and spectacular caves of Niah have been subject of much research and interest, the existence of small epiphreatic caves at the foot of the karst towers has not previously been documented in this region of NW Borneo. The study documents and reports an epiphreatic cave passage at water table elevation in the Painted Cave karst tower where several large caves are also known. The semi-flooded passage is over 480 m long and traverses the tower from east to west, intersecting other much larger vadose caves. The epiphreatic flow path is characterized by a number of sinking streams and resurgences as well as several sharp bends in the passage indicating joint control. As an initial attempt this study was undertaken to correlate the water chemistry along the cave path to understand the geomorphological controls. A preliminary campaign of water sampling was carried out with samples collected at ten locations along the path of the cave stream and analyzed for pH, EC, TDS, DO, Eh, major ions, nutrients and trace metals. The results show that dissolution of host rock and leaching of organic matter are the dominant controlling factors for the geochemistry of surface water along the cave stream passage. During dry conditions the water was under-saturated for carbonate minerals but not aggressive suggesting that most dissolution and erosion occurs during flood conditions. This is supported by the morphology of the passages and features of the rock wall both inside the caves and at the foot of the karst tower.  Key words: Karst, Niah cave, Epiphreatic, Hydrogeochemistry, water table. Jame epifreaticne cone v kraskem stolpu Niah (severozahodni Borneo): pojavnost, morfologija in hidrogeokemija Epifraticne jame nastajajo na meji med vadozno in freaticno cono. Prepoznavanje epifreaticnih elementov v bloku dvignjenega masiva nam omogoca razbrati faze dvigovanja masiva oz. spuscanja erozijske baze, zato so epifreaticne jame in procesi se posebno zanimivi. Ceprav so o jamah stolpa Niah opravili stevilne studije, nobena od teh ne obravnava epifreaticnih jam ob vznožju kraskega stolpa. Ta studija obravnava epifreaticne rove na ravni vodne gladine v stolpu Painted Cave v severozahodnem Borneu, kjer sicer poznamo vec velikih jam. Delno potopljen rov je dolg vec kot 480 m in preci stolp od vzhoda proti zahodu ter pri tem seka se vec drugih, veliko vecjih vadoznih jam. Epifreaticni tok je povezan z vec ponikalnicami in izviri, zanj so znacilne nagle spremembe smeri, ki sledi vodilnim razpokam. Namen studije je povezati kemijo vode vzdolž toka in aktivne geomorfoloske dejavnike. Vzorcenje in analize vode na desetih lokacijah so dali podatke o pH, elektricni prevodnosti, skupni raztopljeni snovi (TDS), raztopljenem kisiku, Eh ter o koncentraciji glavnih ionov, hranil in kovin v sledeh. Rezultati so pokazali, da sta raztapljanje maticne kamnine in izpiranje organskih snovi prevladujoca dejavnika geokemije vode v kanalu. V susnem obdobju je voda rahlo nenasicena na kalcit, a je agresivnost majhna, kar kaže na to, da glavna faza razvoja poteka v poplavnih obdobjih. To potrjujejo tudi morfologija rova in jamske skalne oblike v jami in ob vznožju kraskega stolpa. Kljucne besede: kras, jama Niah, epifreaticna cona, hidrogeokemija, vodna povrsina.

Epiphreatic caves in Niah karst tower (NW Borneo): occurrence, morphology and hydrogeochemistry