General geology and water geochemistry of Gua Bewah, Tasik Kenyir, Terengganu.

The study focuses on the general geology, hydrology and geochemistry of Gua Bewah,Tasik Kenyir. The study area for this research lies between latitude 5° 09” 01.92”N 102°31” 36.33” E, 5° 09” 51.16” N 102° 56” 46.66” E and longitude 4° 48” 53.29” N 102°32” 06.16” E, 4° 48” 56.65” N 102° 56” 53.03” E. This research is intended to produce an updated geological map,to analyses the physical and chemical parameters of water at the study area and to identify geochemical process of water. The general study of Bewah cave which situated at lake Kenyir was conducted by field work investigation and laboratory analysis which is thin section or rocks sample. The study area consist of major limestone facies and minor sandstone also present in that area which aged Middle Permian. The method for data interpretation is by using piper trilinear diagram, and Schoeller diagram in order to classify the water type. Water samples were taken from 10 locations within the study area. The sampling site was chosen due to the availability of accessing the location. The analyzed chemical parameter include major cation like sodium (Na+), potassium (K+), calcium(Ca2+). magnesium (Mg2+) and anions such as bicarbonate (HCO3-), chloride (CL-), nitrate (NO3-). Generally, the water in study area is safe for drinking when compared with the WHO and MOH standard except for calcium, magnesium and bicarbonate which has slight high value compared to others.