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Maritime map of the Philippines, with inset maps of bays showing bathymetry (sea depth), shoals, reefs and anchor points. There is also an inset map of Taal Volcano, and elevations (side views of terrestrial landmarks like mountains and islands).

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.

The coloured areas on this map indicate the coastal regions that flooded after the 1883 Krakatoa volcanic eruption. Krakatoa is shown in the centre of the Sunda Strait, between Sumatra and Java.

A map of the effects of the 1883 Krakatoa volcanic eruption. The red line is the boundary of the collapsed area. Black numbers are sea depth before the eruption; red numbers are after. A line above a number means no ground found at that depth.

A map showing the results of the 1883 eruption of the Krakatoa volcano. Black numbers indicate sea depth before the eruption; red numbers are after.

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.

Two maritime routes—for use during the North-east and ‘fair’ monsoons—are shown on this late 19th century navigation map. The routes lead north through Southeast Asia, passing the Philippines, and ending in Hong Kong. Bathymetry (sea depth) is shown.

An Atlas produced by an expedition in central Sumatra, including: maps of topography, geology, a number of rivers in the region; drawings of mountains, graphs of lengths of roads; family trees of the royal families of Djambi (Jambi) and Palembang.

Produced by the British Admiralty’s Hydrographic Office, this map includes various navigational aids, such as maritime routes, bathymetry (sea depth), tide and current data, and elevations (side views of hills and mountains to use as landmarks).

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.