| 21. | The featured activity is an hour-long boat ride on the subterranean river in a 17-person boat equipped with lighting.
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| 22. | A Karst topography consisting of caves, sinkholes, and subterranean river channels resulted but were later filled with more limestone.
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| 23. | We took a leisurely inner-tube ride down a lazy river, then jumped into natural wells fed by subterranean rivers.
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| 24. | It has a subterranean river long, with an average depth of and maximal depth of, and a daily discharge of.
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| 25. | Sinking Creek was so named because it is a subterranean river for some of its length, disappearing underground before surfacing again.
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| 26. | Some fish ( popularly known as cavefish ) and other troglobite organisms are adapted to life in subterranean rivers and lakes.
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| 27. | The building itself, was built over a 900 year old sacred well drawing from the River Fleet, a subterranean river underneath London.
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| 28. | After taking a wrong turn, they run out of water and Axel almost dies, but Hans taps into a neighbouring subterranean river.
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| 29. | Most tourists come to Puerto Princesa to visit the Puerto Princesa Subterranean River National Park located 50 km north of the city.
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| 30. | Losing streams are also common in regions of karst topography where the streamwater may be completely cavern system, becoming a subterranean river.
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