They showed that the Indian Ocean might be linked to the World Oceans, with the eastern limit of the inhabited world beyond the Malay Peninsula being the Island of the Jewel in the Sea of Darkness. The Ptolemaic eastern shore became the Dragon's Tail peninsula.
The study suggested a link between the Indian and World Oceans, with the eastern edge of the populated world extending beyond the Malay Peninsula to the Island of the Jewel in the Sea of Darkness.  The Ptolemaic eastern coastline was then designated as the Dragon's Tail peninsula.