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An aquifer was an underground river. Aquifers ran under the "southern plate-steppes" of Cartago. (PROSE: The Bloodletters [+]Loading...["The Bloodletters (novel)"])
On the planet Maught, where water was scarce, rumours circulated about an underground river which the Tenth Doctor eventually brought up to the planet's surface. (COMIC: The Green, the Bad and the Ugly [+]Loading...["The Green, the Bad and the Ugly (comic story)"])