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Map of Dutch colonial territory in New Guinea and nearby islands, featuring the 1850 route of the Dutch schooner Circe under Lieutenant Brutel de la Rivière. (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)

Map featuring two maritime routes by Dutch explorers along the north coast of New Guinea: Jacob Le Maire and Willem Schouten (1616); and Abel Tasmanin (1648). (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)

The Dutch East Indies are bordered in red on this mid-19th century map. A maritime postal route from China to Europe, via Singapore and Penang, is shown. Another maritime route, from Batavia to Singapore, is also marked.

Hand-drawn map of routes through the Iris-straat (Iris Strait) and Triton’s-baai (Triton Bay) in New Guinea. Bathymetry (sea depth) and reefs are shown, and there is an elevation (side view) of the islands and hills seen at the bay’s entrance.