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A hand-drawn map of the northern part of Batavia Bay, showing rivers and the city of Batavia (Jakarta). An inset map shows a proposed canal designed to join two parts of the Antjol River.

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.