

-30°- 



a» » 



TROPIC Of CANCER 



V 



EQUAfOK 



0°- 



s/v* 



igQpic Of CAmqptN 



When the Challenger stopped at St. Paul's 

 Rocks to make astronomical and magnetic 

 observations, her small boats found it 

 almost impossible to land because of the 

 strong currents surging among the channels. 



'd,or,\ 



The topography of the Indian Ocean floor 

 is not so well known as that of the other 

 oceans, but there is evidence of a mid-ocean 

 ridge running northward as far as Kerguelen 

 through New Amsterdam to the Seychelles 

 and Chagos islands. The Maldive Ridge 

 is a remarkably sharp feature. The 

 greatest depths are in troughs near the 

 Sunda Strait. 24,459 feet deep; and near 

 the Andaman islands, 17,247 feet. 



187 



!>"'■' • TO.' 



JmBBLA 



