Cape Blanco, a low rocky point on the W. coast of Africa, in lat. 20° 47' N., Ion. 17° 4' W., extending from the main shore in a S. W. direction for more than 30 m. into the Atlantic, and forming the western extremity of the Sahara. In bending to the south it partially encloses a large harbor called the Great Bay, one of the very few sheltered places of anchorage to be found on this most dangerous part of the African coast. Cape Blanco forms the western end of the great sandstone ridge called the Jebel el-Abiad (White mountains), which extends eastward into the Sahara beyond the limits of exploration. The cape is almost completely covered with shells of many kinds and sizes, the number and peculiar position of which have long furnished a perplexing question to naturalists. Sand hills formed by winds from the desert extend along the central ridge of the point, their forms constantly changing with new accumulations. Boats from the Canary islands visit the cape regularly for fishing.