Geological Survey Ireland, Programmes > Groundwater Activities > Karst landforms > Enclosed depressions, 2023 ([Internet, 2023-09-19](https://www.gsi.ie/en-ie/programmes-and-projects/groundwater/activities/understanding-irish-karst/karst-landforms/Pages/Enclosed-depressions.aspx#:~:text=A%20doline%20%28or%20sinkhole%20as,in%20both%20diameter%20and%20depth.%29)