PEMBA, an island off the E. coast of Africa, N. of Zanzibar, S. Lat. (of the N.W. end) 4. 52, E. Long. 39. 44; length about 40 miles, breadth 10. It is low, fertile, and well wooded. Rice is extensively cultivated; and the island serves as the granary to the adjacent country. There are several creeks and indentations in the island, and an excellent harbour.