The abyssal zone is a layer of the pelagic zone of the ocean at depths of 13,000 to 20,000 feet. This zone remains in perpetual darkness. These regions are also characterized by continuous cold and lack of nutrients. The abyssal zone has temperatures around 36 to 37 °F. It is the deeper part of the midnight zone which starts in the bathypelagic waters above. The zone just below is called the hadal zone.

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