The Dom is a mountain of the Pennine Alps, located between Randa and Saas-Fee in the canton of Valais in Switzerland. With a height of , it is the seventh highest summit in the Alps, overall. Based on prominence, it can be regarded as the third highest mountain in the Alps, and the second highest in Switzerland, after Monte Rosa. The Dom is the main summit of the Mischabel group (German: Mischabelhörner), which is the highest massif lying entirely in Switzerland. The Dom is noteworthy for its 'normal route' of ascent having the greatest vertical height gain of all the alpine 4000 metre peaks, and none of that route's 3,100 metres of height can be achieved using mechanical means. Although Dom is a German cognate for 'dome', it can also mean 'cathedral' and the mountain is named after Canon Berchtold of Sitten cathedral, the first person to survey the vicinity. The former name Mischabel comes from an ancient German dialect term for pitchfork, as the highest peaks of the massif stand close to each other. Geographical setting The Dom is the culminating point of a chain running from the Schwarzberghorn on the south, at the intersection with the main chain of the Alps (Alpine watershed), to the Distelhorn on the north and ending above the town of Stalden. The chain lies entirely in the district of Visp. The two valleys separated by the range are the Mattertal on the west and the Saastal on the east. The towns of Randa and Saas-Fee lie both six kilometres from the summit (to the west and the east, respectively). The elevation difference between the summit and the valley floor is 3,150 metres on the west side (Randa) and 3,000 metres on the east side (Saas-Grund). On the Mattertal side, the Dom faces the almost equally high Weisshorn and, on the Saastal side, it faces the Weissmies. The Dom is the highest point of the Saastal and the second highest mountain of the Mattertal after Monte Rosa. Since the Dom is not on the main Alpine chain, the rivers flowing on both the west and east side of the massif end up in the same major river, the Rhone, through the Mattervispa and the Saaservispa. The Dom is the highest mountain in the Alps with this peculiarity. The Mischabel group includes many subsidiary summits above 4,000 metres. To the north lies the Nadelgrat, composed