This study was conducted in the Rantau Nipis area, South Sumatra, covering an area of approximately 2 × 2 km. Geographically, the area is located around Lake Ranau and is part of the Bukit Barisan Mountain Range system, functioning as a regional recharge area. The study aims to analyze the physical and chemical characteristics of groundwater, degtermine hydrochemical facies using the Piper, St…