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- The area below the abyssal zone is the sparsely inhabited hadal zone.
- It is found in the abyssal zone in waters around Australia and New Zealand.
- The abyssal zone extends from to.
- The aphotic zone is further divided into additional zones : the bathyal zone, the abyssal zone, and the hadal zone.
- A small amount of primary production is generated deep in the abyssal zone around the hydrothermal vents which exist along some mid-oceanic ridges.