Castor () is a mountain in the Pennine Alps on the border between Valais, Switzerland and the Aosta Valley in Italy. It is the higher of a pair of twin peaks (), the other being Pollux, named after the Gemini twins of Roman mythology. Castor's peak is at an elevation of , and it lies between Breithorn and the Monte Rosa. It is separated from Pollux by a pass at , named Passo di Verra in Italian and Zwillingsjoch in German. Ascents are usually made from the alpine hut Capanna Quintino Sella on the Italian side, by means of the Felikjoch and the long and narrow southeast ridge. From the Swiss side, ascents start from Klein Matterhorn and go by way of the Italian glacier Grand Glacier of Verra and the mountain's west flank. The first ascent was made on August 23, 1861. Image gallery See also List of 4000 metre peaks of the Alps References External links Castor on Summitpost Alpine four-thousanders Mountains of the Alps Mountains of Italy Mountains of Switzerland Pennine Alps Italy–Switzerland border International mountains of Europe Mountains of Valais Four-thousanders of Switzerland