The research area is in Muara District, North Tapanuli Regency, North Sumatra. This area is included in the Toba Caldera Area, which is located south of Lake Toba with volcanic activity that took place during the Kwarter period which produced three main products in the form of OTT (Old Tufa Toba), MTT (Middle Tufa Toba), and YTT (Young Tufa Toba). This study aims to examine the potential of geo…