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The Northern Solomons were the more northerly group of islands in the Solomon Islands archipelago over which Germany declared a protectorate in 1885. Initially, the German Solomon Islands Protectorate included, in the south-east, Choiseul, Santa Isabel and the Shortlands, along with Ontong Java Atoll. These were transferred to the British Solomon Islands Protectorate in 1900. The main island in the region, Bougainville, continued under German administration until World War I, when it fell to Australia, and after the war, it formally passed to Australian jurisdiction under a League of Nations mandate.