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Navigation maps of two bays on the southeast coast of Borneo. Anchorages, bathymetry (sea depth), buoys, shoals and other obstructions are shown. There is an inset map of the roadstead—a body of water sheltered from tides/currents—at Balikpapan Bay.

Late 19th century map of the Makassar Strait between Borneo and Celebes (Sulawesi), with shoals and reefs, bathymetry (sea depth), shipwrecks and other navigation aids marked. On land, mountains, with their heights, and rivers are shown.