Labuhan Tangga Besar Village and its Surroundings, Bangko District, Rokan Hilir District, Riau Province. This village only consists of 1 formation, namely the Old Surface Sediment Formation (Qp), which has acidic swamp and peat conditions. The purpose of this study was to determine the distribution and direction of groundwater surface flow, the feasibility of the physico-chemical quality of the…