Two small (2ha), shallow (<1m) karst lagoons, situated on the south shore of the Shannon estuary 5km northwest of Askeaton, Co. Limerick. The two lagoons are connected intermittently depending on water levels by a small channel. Seawater enters Quayfield Lough through limestone grykes, and salinity in this lagoon measured 28psu at the time of sampling (27/9/03). Seawater occasionally then flows into the Poulaweala Lough, but this is now almost a freshwater lake.