The Swiss Federal Office of Topography and ETH Zürich[REF] indicate a point North of Lake Toma and the Rein da Tuma as the source of the Rhine (and also of the Vorderrhein), and as the source of the Hinterrhein a point in the upper Rheinwald valley, East of the Rheinwaldhorn.
In the area of the headwaters of the Rhine there is this situation that the term Rhine is used is part of the name of many rivers, in many different spellings, such as Rhine,Rein, 'Rain, Ragn, Ren, Reno and Rin.