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To aid navigation, this map shows small islands, shoals and reefs, maritime routes for use during monsoons or at particular times of the year, bathymetry (sea depth), tide information, shipwrecks, compass roses and landmark mountains at the coasts.

Map of the Dutch colonial administrative region (residency) of Soerabaya (Surabaya, Java), including the Madura Strait and an inset map of the island of Bawean. (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.

Map of the Dutch colonial administrative region of the island of Madoera (Madura), featuring bathymetry (sea depth), and an inset map of the Kangean Islands. (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)