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Map of Deli on the northeast coast of Sumatra, divided into parcels of land which are labelled—in capital letters—with the names of businesses. Place names are in lowercase. The coast, rivers and land parcels are rendered in simple straight lines.

The use of hachures—short lines/dashes that give a sense of the shape and steepness of terrain—highlight the mountain ranges along the west coast of this map of Sumatra. Many rivers flow east from the mountains to the Malacca Strait.

A topographical and geological map of southern Sumatra, over four sheets. Areas of igneous and sedimentary rock, coal, fossils, petroleum, active volcanoes and hot springs are marked, along with mountains, rivers and marshland, roads and settlements.