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Map of maritime Southeast Asia, with four inset maps of locations in the region: Surabaya, some of the Lesser Sumba Islands, and Buton and Muna islands of the coast of Sulawesi. Mountains, forests, settlements and fields are represented pictorially.

Hand-drawn portolan (nautical) chart of the Lesser Sunda Islands, featuring a rhumbline network (the web of interconnected lines), shoals, reefs, elevations (side views of landmark mountains), and names of coastal settlements, all to aid navigation.