Cumberland West Bay is a bay forming the western arm of Cumberland Bay, South Georgia. It is entered southward of Larsen Point, where it is 2.5 miles (4 km) wide and extends 7 miles (11 km) in a southwest direction. It is separated from Cumberland East Bay by Thatcher Peninsula. Papua Beach is situated on its southeast shore.
This feature was first surveyed by the Swedish Antarctic Expedition, 1901–04, who named it "West Bay". It was remapped during 1926–29 by Discovery Investigations (DI) personnel and renamed "West Cumberland Bay". The shortened form West Bay was simultaneously used. Following the South Georgia Survey, 1951–52, the UK Antarctic Place-Names Committee proposed altering the name to Cumberland West Bay and rejecting all other names. This change brings together information about the whole of Cumberland Bay together in indexes.[1]