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Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

Map of Timor with Dutch and Portuguese flags marking military forts. Details are represented pictorially e.g. villages by small houses, forests by trees. There are extensive handwritten annotations, with some text translated from Dutch to French.

This mid-17th century map of Southeast Asia is from Isaac Commelin’s book describing the voyages of the Dutch East India Company ‘Begin ende voortgangh…’. There is an inset map of the island of Botton (Buton Island, southeast of Celebes (Sulawesi)).