abyssopelagic zone

[ə-bĭs′ə-pə-lăj′ĭk]

A layer of the oceanic zone lying below the bathypelagic zone and above the hadopelagic zone, at depths generally between about 4,000 and 6,000 m (13,120-19,680 ft). The abyssopelagic zone ranges in temperature from 10° to 4°C (50° to 39°F).