Pollux (4,092 m) is a mountain in the Pennine Alps on the border between Valais, Switzerland and the Aosta Valley in Italy. It is the lower of a pair of twin peaks (Zwillinge), the other being Castor, named after the Gemini twins of Roman mythology. It is separated from Castor by a pass at 3,845 m (12,615 ft), named the Passo di Verra in Italian and the Zwillingsjoch in German.