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Underground River

Sources:    Time:2013-12-27

      An underground river, also called hidden river, is an underground passage with characteristics of a river. Swallet stream is the section where ground river flow from the surface to underground. Its main difference from underground river is that an swallet stream has a visible entrance and outlet of flow, while an underground river dose not have. In addition, the water flow in the entrance of a swallet stream is the main source of water flow in its outlet.