UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

swallet, swallow hole
(British.) A place where water disappears underground in a limestone region. A swallow hole generally implies water loss in a closed depression or blind valley, whereas a swallet may refer to water loss into alluvium at a streambed, even though there is no depression [10]. See also doline; ponor; sink; sinkhole; stream sink; sumidero.