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Map of the Kai Islands, in the Banda Sea, designed for navigation: it features bathymetry (sea depth), tide data (arrows), reefs and shoals. Obstructions in the water are marked ‘kr’ (coral), ‘m’ (mud), ‘s’ (shells), ‘st’ (stones), and ‘z’ (sand).

Navigation map of the mouths of the Koealoe (Kualu) and Panei (Barumun and Bila) rivers on the east coast of Sumatra. Large sand and mud banks, bathymetry (sea depth), bouys and currents are marked. On land, tall trees are shown to use as landmarks.

Map marking the border (in orange) agreed between British and Dutch territory on Borneo in 1891. Alternative borders are shown: according to the Dutch (blue), according to the British North Borneo Society (yellow) and proposed by the British (green).

Map marking the border (in orange) agreed between British and Dutch territory on Borneo in 1891. Alternative borders are shown: according to the Dutch (blue), according to the British North Borneo Society (yellow) and proposed by the British (green).

Map of the Karimunjawa Islands (Java Sea) marked with the locations of shoals, reefs, anchor points and sea depth (bathymetry) to aid navigation; and with geological sites (recent rock/coral formation, basalt rock, schist rock and quartz).

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.

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.

Plan of the pier at the port of Batavia (Jakarta). Lines indicate the changing position of the beach and the sandbank over the years, and numbers show the water depth (red numbers=measured in the year 1823, blue=1831 and black=1864).

Plan of the pier at the port of Batavia (Jakarta). Lines indicate the changing position of the beach and the sandbank over the years, and numbers show the water depth (red numbers=measured in the year 1823, blue=1831 and black=1864).

A hand-drawn plan for improvements to the pier at the port in Batavia (Jakarta), showing profiles of stone and concrete walls/buttresses to be built along the sides of the ‘Haven Kanaal [Harbour Canal]’. Blue lines on the profiles mark water level.

Map of the Dutch town and naval base on the island of Onrust in Batavia (Jakarta) Bay, and adjacent islands, featuring the dock, boat and work sheds, ammunition stores, forge, hospital and housing. Shoals, reefs and bathymetry (sea depth) are marked.