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On this map of Southeast Asia, numerous small islands, shoals and reefs are marked and named, especially in the South China Sea and around the Sunda and Maluku islands. Submarine cables to carry telegraph messages around the region are also shown.

Three maps of the Caroline Islands. One shows colonised areas in Southeast Asia: Dutch East Indies; British North Borneo, British New Guinea; German New Guinea; Philippines (Spain); Portuguese Timor. The route of the Challenger expedition is marked.