German New Guinea (German: Deutsch-Neuguinea) was the first part of the German colonial empire. It was a protectorate from 1884 until 1914 when it fell to Australian forces following the outbreak of the First World War. It consisted of the northeastern part of New Guinea and several nearby island groups. The mainland part of German New Guinea and the nearby islands of the Bismarck Archipelago and the North Solomon Islands are now part of Papua New Guinea.
The mainland portion, Kaiser-Wilhelmsland, was formed from the northeastern part of New Guinea. The islands to the east of Kaiser-Wilhelmsland, on annexation, were renamed the Bismarck Archipelago (formerly the New Britannia Archipelago) and the two largest islands renamed Neu-Pommern ("New Pomerania", today's New Britain) and Neu-Mecklenburg ("New Mecklenburg, now New Ireland). Due to their accessibility by water, however, these outlying islands were, and have remained, the most economically viable part of the territory.
With the exception of German Samoa, the German islands in the Western Pacific formed the "Imperial German Pacific Protectorates". These were administered as part of German New Guinea and they included the German Solomon Islands (Buka, Bougainville, and several smaller islands), the Carolines, Palau, the Marianas (except for Guam), the Marshall Islands, and Nauru. The total land area of German New Guinea was 249,500 square kilometres.
After the Treaty of Versailles of 1919, Germany lost all its colonial possessions, including German New Guinea. It became the Territory of New Guinea, a League of Nations Mandate Territory under Australian administration until 1949 (interrupted by Japanese occupation during the New Guinea campaign) when it was merged with the Australian territory of Papua to become the Territory of Papua and New Guinea, which eventually became modern Papua New Guinea.