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Ponemah Bog Wildlife Sanctuary features a three-acre pond surrounded by a floating sphagnum mat and encircled by upland oakpine woods. This bog resulted from the last receding glacier, which left a kettle hole pond in the Souhegan River outwash plain. Changes over the last 12,000 years have been recorded by the bog itself, which has preserved, in its layers of peat, pollen blown in from the surrounding woods. The moss mat has advanced over the last 6000 years to gradually fill in the pond with plant remains.