CAYAGAN SOOLOO ISLES, a group of islands in the Eastern Seas, lying off the north-east coast of Borneo. The largest is about twenty miles in circumference, of a middling size. The soil is rich and luxuriant, and it is covered with trees. In 1774 it was dependent on Sooloo, and was much frequented by pirates. Long. 118. 50. E. Lat. 70. N.