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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.

Topographic map of the island of Bawean in the Java Sea, with terrain shown by contour lines, and mountains labelled with their heights. Villages, forests (heavy, light, teakwood) and crops (coconut, coffee, alang-alang, rice, bamboo) are marked.