REGENERATION OF THE DARK CONTINENT. 



81 



ing, parallel with the coast-line, we find ranges of mountains or 

 elevated lands forming the outer edges of interior plateaux. 



The most striking feature of Northern Africa is the immense 

 tract known as the Sahara or Great Desert, which is inclosed on 



the north by the Atlas Mountains (greatest height, 12,000 to 13,000 

 feet), the plateau of Barbary, and that of Barca, on the east by 

 the mountains along the west coast of the Red Sea, on the west by 

 the Atlantic Ocean, and on the south by the Sudan. 



H. B. G.— 6 



