There is a mountain range that is located south-west of the Marigny in Valais and is the highest and most extensive mountain range system that lies entirely in what country?
Mont de l'Arpille Mont de l'Arpille is a mountain of the Alps, located south-west of Martigny in the Swiss canton of Valais. It is located north of the Col de la Forclaz and geographically part of the Mont Blanc massif.
Gailtal Alps The Gailtal Alps (German: "Gailtaler Alpen" or "Drauzug"), is a mountain range of the Southern Limestone Alps in Austria. It rises between the River Drava ("Drau") and the Gail valley (in southwestern Carinthia) and through the southern part of East Tyrol. Its western group called "Lienz Dolomites" ("Lienzer Dolomiten"), is sometimes counted as part of this range and sometimes seen as separate.