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ANNUAL KEPOET SMITHSONIAN INSTITUTION, 1919. 
gorges and waterfalls. One of the most beautiful of the falls is 
Kaieteur Falls, 741 feet high and 400 feet wide. The only mountains 
as distinguished from hills lie on the border in the region where 
Fig. 1. — South. America, showing position of British Guiana. 
British Guiana, Venezuela, and Brazil join. The culminating peaks 
are Roraima and Kukenaam, table mountains with precipitous sides 
rising 5,000 feet above the plateau and reaching an altitude of about 
