Mt. Guna is a distinct Miocene shield volcano on the Ethiopian plateau. Its surface waters drain radially, whereas deep percolated water feeds a series of springs at the interface between Mt. Guna’s volcanic tuffs and the underlying Ashangi trap basalt. This study fills the knowledge gap for reconstructing the past hydro (geo)logical and geomorphological changes and for predicting future scenarios on similar Miocene volcanoes in the highlands.