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| Location | south of Ballyvaughan (Co. Clare, Irland), "Burren", "Aillwee Cave" |
| Comment | 3rd excerpt from the brochure: over a period of thousands of years, countless small channels cut through the porous rock. One of these channels enlarged and developed into a stream of fast-moving water. That is why the cave has the shape of a half-tube, similar to a vault. This stream formed a ditch about 20-30m deep. |