The mountain is mainly covered by eternal snows and glaciers, except for its summit which is a rocky ridge orientated west-east, near to and perpendicular to the main watershed between Switzerland and Italy (the river basins of the Rhône and the Po on the Swiss and Italian side, respectively). The connecting point between them is the Grenzgipfel () right on the border, and therefore also the highest peak on the Italian side. Thus Monte Rosa is the highest mountain in the Alps whose summit is not on the main alpine watershed, although it is off by only 150 metres. The Silbersattel () and Grenzsattel () are the passes located north and south to the summit. The three main secondary summits of Monte Rosa are (from north to south): the Nordend (4,609 m; north of the Dufourspitze), the Zumsteinspitze (4,563 m; south of the Dufourspitze) and the Signalkuppe (4,554 m, ), all of them being positioned right on the Swiss-Italian border. Other secondary summits are the Parrotspitze (4,432 m), the Ludwigshöhe (4,341 m) and the Vincentpiramid (4,215 m). All of them originally have German names, since even the Italian valleys used to be by German-based Walsers inhabited valleys.