FLAT ISLAND, a small island in the Eastern Seas, situated near the north coast of the island of Flores. Long. 120. 59. E. Lat. 7. 59. S. Also an island in the Mergui Archipelago, lat. 10. 27. N.; and another near the east coast of New Zealand, long. 183. 13. W. lat. 37. 40. S.