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On this map of Sumatra, the west coast mountain ranges contrast with the rivers to the east. An inset map of Singapore focuses on jungles along the coasts, and features bathymetry (sea depth) around the south coast and along the Singapore Strait.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, and names of coastal settlements, all to aid navigation. With a colourful compass rose.