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This map of the Madura Strait between Java and Madura is designed to aid navigation: bathymetry (water depth), lighthouses, shoals and reefs, rocks and mud, anchor points, and landmark mountains are all marked. Text describes the tidal conditions.

Chart of the north coast of Java, featuring a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals, reefs and side views of landmark mountains (elevations), all to aid navigation. With an inset map of nearby islands.

Chart of the north coast of Java, featuring a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals, reefs and side views of landmark mountains (elevations), all to aid navigation. With an inset map of nearby islands.

Map of maritime Southeast Asia, with four inset maps of locations in the region: Surabaya, some of the Lesser Sumba Islands, and Buton and Muna islands of the coast of Sulawesi. Mountains, forests, settlements and fields are represented pictorially.

Sumatra and the Malay Peninsula feature on this map of the Indian Ocean. Enganno Island, west of southern Sumatra, has a label that translates as ‘inhabited by very pernicious savages’. An inset map depicts the Madura Strait between Java and Madura.

Colourful hand-drawn portolan (nautical) navigation chart, featuring bathymetry (sea depth), shoals and reefs, and anchor points. The coasts have pictorial representations of landmarks (trees, houses, mountains). Orientated with south at the top.