80 meters
100 meters
120 meters
200 meters
Sunlight entering the water may travel about 1,000 meters into the ocean under the right conditions, but there is rarely any significant light beyond 200 meters. The ocean is divided into three zones based on depth and light level. The upper 200 meters of the ocean is called the euphotic, or “sunlight,” zone.
The zone between 200 meters and 1,000 meters is usually referred to as the “twilight” zone, but is officially the dysphotic zone. In this zone, the intensity of light rapidly dissipates as depth increases. Such a minuscule amount of light penetrates beyond a depth of 200 meters that photosynthesis is no longer possible.
The aphotic zone exists in depths below 1,000 meters. Sunlight does not penetrate to these depths and the zone is bathed in darkness. The aphotic zone is further subdivided into the bathypelagic zone (or midnight zone) between 1,000 and 4,000 meters, the abyssopelagic (or the abyss) between 4,000 and 6,000 meters, and the hadopelagic zone (or hadal zone) 6,000 meters and deeper.
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