Its relief is enriched with deep karst hollows, valleys and funnel-shaped depressions.
2.
This suggests the existence of a deep karst system and vigorous karst groundwater circulation at depth.
3.
"A . lira " is endemic to the Great Appalachian Valley in Virginia and West Virginia, where it " swims freely through calcite-saturated waters of deep karst aquifers ".
4.
"' Provadia "'( ) is a town in northeastern Bulgaria, part of Varna Province, located in a deep karst gorge ( Provadia syncline ) along the Provadia River not far from the Bulgarian Black Sea Coast.
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