The Cocos (Keeling) Islands, officially the Territory of Cocos (Keeling) Islands, are an Australian external territory in the Indian Ocean, comprising a small archipelago approximately midway between Australia and Sri Lanka and relatively close to the Indonesian island of Sumatra. The territory's dual name reflects that the islands have historically been k…The Cocos (Keeling) Islands, officially the Territory of Cocos (Keeling) Islands, are an Australian external territory in the Indian Ocean, comprising a small archipelago approximately midway between Australia and Sri Lanka and relatively close to the Indonesian island of Sumatra. The territory's dual name reflects that the islands have historically been known as either the Cocos Islands or the Keeling Islands.