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Southeast Asia is on sheet four of this map. British colonial territory—British Burma, the Straits Settlements, Sarawak, Brunei, British North Borneo—is highlighted in red, with Dutch, Spanish, French and Portuguese territory also shown.

Two navigation maps for the north coast of Celebes (Sulawesi), featuring bathymetry (sea depth), landmark mountains, reefs and shoals. Obstructions in the water are marked ‘kr’ (coral), ‘m’ (mud), ‘s’ (shells), ‘st’ (stones), and ‘z’ (sand).

A navigation map of Kwandang Bay on the north coast of Celebes (Sulawesi). It features bathymetry (sea depth), reefs and shoals. Obstructions in the water are marked ‘kr’ (coral), ‘m’ (mud), ‘st’ (stones), and ‘z’ (sand).

A navigation map for the north coast of Celebes (Sulawesi), featuring bathymetry (sea depth), reefs and shoals. Obstructions in the water are marked ‘kr’ (coral), ‘m’ (mud), ‘st’ (stones), and ‘z’ (sand). Five additional maps show details of rivers.

Two maps of bays of Celebes (Sulawesi), including bathymetry (sea depth), reefs and shoals, and coastal hills to use as landmarks. Obstructions in the water are marked ‘kr’ for coral, ‘m’ for mud, ‘st’ for stones, and ‘z’ for sand.

Geological map of the Minahasa Peninsula, Celebes (Sulawesi) showing rock types. Two more topographical maps show the terrain of the northeast tip of the peninsula, with elevation views including of the volcano Mount Klabat.