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They are due largely to sinkholes or depressions caused by solution of the limestone of the region.
Sometimes the water enters the ground through huge holes called sinkholes.
Weathering of the limestone surface created a karst landscape with sinkholes and caves present.
These are sinkholes formed by cave-ins over the underground rivers common in the region.
Oceans are usually full of sinkholes and undercurrents that can pull an unsuspecting swimmer under.