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While smaller groups within the Alps may be easily defined by the passes on either side, defining larger units can be problematic. A traditional divide exists between the Western Alps and the Eastern Alps, which uses the Splügen Pass (Italian: Passo dello Spluga) on the Swiss-Italian border, together with the Rhine to the north and Lake Como in the south as the defining features.
The Alps are often divided into Eastern, Central and Western Alps, even though the boundaries between these subdivisions are arbitrary.The division between the Eastern and Central Alps is approximately the line between St. Margrethen, Chur and Sondrio; the division between the Central and Western Alps is unclear (Pfiffner 2009, p. 25).
Main chain of the Alps. The main chain of the Alps, also called the Alpine divide is the central line of mountains that forms the drainage divide of the range. Main chains of mountain ranges are traditionally designated in this way, and generally include the highest peaks of a range.
Map of the Aar basin. High Rhine. Aare. Limmat. Linth () . Lake Walen. Seeztal; Klöntal; Sernftal; Reuss. Lake Lucerne. Sarner Aa (Brünig Pass connects to the Aare ...
The Western Alps at Mont Blanc and Monte Rosa, the Southern Alps at Braveno, Brixen, Cima d'Asta, Doss del Sabion and the Barbagia and Gallura granites in Sardinia are all examples of Carboniferous and Permian granite pluton and batholith intrusions. Ignimbrite eruptions had an important role at the same time in forming parts of the central ...
The boundary between the western and central arc of the Alps is the line Ivrea – Aosta Valley – Italian Val Ferret – Col Ferret – Swiss Val Ferret – Martigny-Ville – eastern end of Lake Geneva near Montreux/Vevey; The "Central Alps" run from the Col Ferret to the Brenner Pass. Their highest summit is Monte Rosa (4,611 m).
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In the western Alps the Penninic nappes are more obviously present than in the eastern Alps (in Austria), where they crop out as a narrow band. The name Penninic is derived from the Pennine Alps, an area in which rocks from the Penninic nappes are abundant. Of the three nappe stacks the Penninic nappes have the highest metamorphic grade.