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British New Guinea is highlighted in red on this map of New Guinea and Australia, with German and Dutch colonial areas also partially shown. There is a line marking the boundary between the British and German spheres of influence.

New Guinea is divided between British, German and Dutch colonial powers on this map of New Guinea and Australia. There is a line marking the boundary between the British and German spheres of influence. Bays and islands around the coast are named.

Map of British New Guinea, focusing on the sea (islands, shoals, reefs), coast (settlements, bays), mountains and land (‘dense forest’, ‘timbered with Eucalyptus’). Inset maps of Port Moresby, Samarai Island, and the whole island of New Guinea.

Navigation map of Kaiser-Wilhelmsland, in German New Guinea. It features bathymetry (sea depth), reefs and shoals, lighthouses (coloured red and yellow) and landmark mountains. A boundary divides German and British colonial territories on New Guinea.

Three maps of the Caroline Islands. One shows colonised areas in Southeast Asia: Dutch East Indies; British North Borneo, British New Guinea; German New Guinea; Philippines (Spain); Portuguese Timor. The route of the Challenger expedition is marked.

Map showing the results of an 1884 agreement between the Netherlands and Britain to exchange parts of their colonial territories in New Guinea: the red area was ceded by the Netherlands to Britain; green was ceded by Britain to the Netherlands.