REEF ISLAND, a small island in the Eastern Seas, about fifty miles from the west coast of Sumatra, and called also Disastrous Island, from the number of shipwrecks which have taken place near it. Long. 101. 3. E. Lat. 4. S. It is also the name of a small island near the northern coast of the island of Celebes. Long. 122. 48. E. Lat. 0. 8. N.