Cordillera de Vilcanota. A British expedition consisting of John Jewell, Pat O’Donaghue, Ralph Whitling, and Colin Darbyshire left Sicuari May 19, 1956 to establish Base Camp three and a half days later, at 16,000 feet, just south of the Chimboya Pass. They explored the region, including the Imata valley and the west side of the Quenamari ice plateau. They climbed Allcachaya, 18,955 feet, and Imata, 18,400 feet, and several other 18,000-foot peaks in the Imata, Pichiya, and Queccarani groups. They also did some mapping. On July 4 they began their return journey, which took them across the Chimboya Pass to Chabuca and thence to Santa Rosa.