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Most commonly found in rural or wilderness areas, this is simply a very large pit in the ground, with latrines connected to it that work on breaking down waste in a similar fashion to that of a septic tank.
Some pits may be sealed off when full, and the surrounding superstructure moved to a freshly-dug pit, or the pit may have a build-in disposal system with a pump for evacuation to a tanker, so that the waste can either be disposed of, or sent to a waste treatment plant.