94 | The Sea 
ocean. Regions below 3000 fathoms are called deeps. Each 
deep has a name of its own such as “Jeffreys Deep,” “Brooke 
Deep.” The greatest depth that has ever been sounded is off 
Mindanao in the Philippines, 5736 fathoms. The deepest part 
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of the Atlantic is north of Puerto Rico, about 5230 fathoms. 
Ocean deeps are not very numerous and their combined areas 
are small compared to that of the entire ocean. A glance at a 
bathymetric chart shows that the greatest part of the ocean is 
over a thousand fathoms deep, that is about one nautical mile 
