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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.