WESTERN EDGE OF ''GRABEN" 



LAKE TANGANYIKA 



ERUPTIVE ROCK RIDGES FORMING DAM 

 BETWEEN LAKES TANGANYIKA AND KIVU 



LAKE KIVU 



-EASTERN EDGE OF "GRABEN" 



RUSISI RIVER 



ALLUVIAL FLATS 

 REPRESENTING FORMER EXTENTION OF TANGANYIKA 



Bird's-eye view of the North End of Lake Tanganyika and the surround ins; country as far as Lake Kivu. 



['/'o face page S3. 



