Epipelagic zone
From The Encyclopedia of Earth
Oceans and seas (main)
March 27, 2010, 12:00 am
December 5, 2011, 5:51 am
The epipelagic zone, in oceanography, is the uppermost level of a sea, generally construed to be waters of lesser depth than 200 meters.
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Within this layer of the ocean is there the greatest penetration of sunlight, and hence generally the greatest primary biological productivity.
The epipelagic zone is directly above the mesopelagic zone of the ocean. 
Ocean Zones. Source: NOAA
