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Navigation map of the mouth of the Padang Tikar River, on the west coast of Borneo, featuring bathymetric (water depth) routes. Obstructions are marked with letters: ‘m’ (mud), ‘z’ (sand). Trees, hills and fishermen’s houses are shown as landmarks.

Navigation map of the mouth of the Padang Tikar River, on the west coast of Borneo, featuring bathymetric (water depth) routes. Obstructions are marked with letters: ‘m’ (mud), ‘z’ (sand). Trees, hills and fishermen’s houses are shown as landmarks.

A map charting the effects of the 1883 Krakatoa volcanic eruption: a red circle where the eruption was heard; black lines showing the hourly spread of the resulting waves; and a list of ships on which ash fell, or that encountered pumice (with date).

A map of the effects of the 1883 Krakatoa volcanic eruption. The orange line is the islands’ outline pre-eruption; the red line is the boundary of the collapsed area. Red numbers are sea depth. Pre- and post-eruption sizes of the islands are listed.

Map of an expedition exploring two rivers and their tributaries in southern Borneo. Villages and farms are marked (in red for Malay people; in black for Dayak people). Red numbers show height above sea-level in meters; black numbers show latitude.

A late 19th century map of the Dutch East Indies on four sheets, detailing maritime routes around the region. There are also inset maps showing railways, rivers, roads, and telegraph systems, as well as individual islands and cities.

Map of the Minahasa and East peninsulas of Celebes (Sulawesi) focusing on the road system (shown by red lines). There are four inset maps, including one showing indigenous tribal areas, and a list of places with their latitude, longitude and height.

Hand-drawn map of the roadstead—a body of water sheltered from tides/currents, for ships to anchor—at Analaboe (Meulaboh) on the west coast of northern Sumatra. Bathymetry (sea depth), shoals and reefs, and an anchor point are marked.

Six-sheet topographic map of the residency of Cheribon (Cirebon, West Java), with an inset of a geodesic triangle grid. Administrative districts, crops—rice, alang-alang, sugarcane, sugar, coffee, tea—and indigo plant mills are shown.

Map of three regions on the northeast coast of Sumatra, with each region divided into parcels of land which are labelled with the name of a company. Presumably, these companies have been issued the contracts mentioned in the map’s title.

Map of the coastline of the bay of Batavia (Jakarta) showing the extension of the port’s pier (in red, labelled CD), the sand and mud bank and bathymetry (sea depth) in the bay, and notes regarding changes in tide levels over the years.

Map of the residency of Pekalongan, Central Java, divided into two regencies (Pekalongan and Batang) and 12 districts. The southern half is dominated by mountains, with more towns in the northern half near the sea. Sugar factories are marked.