The Tamina River in Switzerland originates on the flanks of Piz Sardona in the Glarus Alps and flows eastwards and northwards to finally merge with the Alpine Rhine after about 18 km total length.
Along its way it flows into the reservoir Lake Gigerwald in the Calfeisen valley. At Vättis it is joined by the Gorbsbach, and flows northeast into the Mapraggsee. The lower section, heading northwards through Bad Pfäfers, forms a deep and narrow gorge called the Taminaschlucht. Finally, it meets the Rhine river near Bad Ragaz.