On 10 November 1774 the expedition sailed east over the Pacific and sighted the western end of the Strait of Magellan on 17 December. They spent Christmas in a bay they named Christmas Sound on the western side of Tierra del Fuego. After passing Cape Horn, Cook explored the vast South Atlantic looking for another coastline that had been predicted by Dalrymple. When this failed to materialize they turned north and discovered an island that they named South Georgia. In a last vain attempt to find Bouvet Island Cook discovered the South Sandwich Islands. Here he correctly predicted that: ...there is a tract of land near the Pole, which is the Source of most of the ice which is spread over this vast Southern Ocean.