At its extreme, it can fill to a depth of over twenty-five feet and is known locally as 'the vanishing lake' due to its ability to fill and empty within days. It has baffled people for centuries with its unique phenomenon. During warm weather, the lake dries out and develops classic 'sun cracks'. In the centre is a hollow or pot where the water drains away. The bed of the Lough is stratified alluvial mud overlying a bed of gravely deposits, the water drains away through this and the underlying rock strata to reappear from limestone rock some two miles away. As a young man, I was told stories about Loughareema, that on certain nights a ghostly carriage and horses could be seen crossing the road through the Lough, walking back home alone from dances in Castle Green at 4 am on a Sunday I would often recall these stories on passing the Lough, though I never saw the ghostly carriage.