Monte Rosa (Italian and German) or Mont Rose (French) is a huge ice-covered mountain in the Alps, located on the watershed between northern and southern Europe. Its main summit, named Dufourspitze in honor of the surveyor Guillaume-Henri Dufour, culminates at 4,634 metres (15,203 ft) above sea level and is followed by the three nearly equally high subsidiary summits of Nordend, Zumsteinspitze and Signalkuppe. Monte Rosa is the highest mountain of both Switzerland and the Pennine Alps and is also the second-highest mountain of the Alps and Europe outside the Caucasus.