The Rheinwaldhorn is the culminating point of the eastern portion of the Lepontine Alps and the Adula group. In this area, the watershed between the Rhine and the Po river has no determinate direction, and exhibits a dislocated appearance. The peaks of the Adula form an irregular group, all the highest lying in a cluster not more five kilometres distant from the centre, which may be fixed as the foot of the Rheinwald Glacier. From the central group a considerable range extends due south more than 15 kilometres, between Val Blenio and Val Calanca, gradually diminishing in height. A parallel ridge connected with the main massif divides the Val Calanca from Val Mesocco; it surpasses but in few points the height of 9,000 feet. The northern ridge, longer but less regular than the first-mentioned, extends fully 20 kilometres, from the central group to the Piz Nadils over Sumvitg in the valley of the Vorderrhein.