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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.