Rostellan Lake is an artificial lagoon in Cork harbour, with artificial barrier and outlet, though possibly it was a natural lagoon historically. The lagoon is moderate sized (50ha), shallow (<2m) and it seems that brackish conditions only exist near the causeway. In September 2003, salinity ranged from 0.5psu at the eastern end to 25psu near the outlet.

Situated 2km southwest of Midleton on the northern shore of Cork harbour.  Ballyvodock lagoon is a small (2ha), shallow (1m) artificial lagoon formed behind a coastal embankment, ranging in salinity at the time of sampling (7-8/9/06) from 15-25psu.

Situated on Great Island, north of Cork Harbour, 1.5km east of Cobh. A small (4ha) artificial lagoon formed behind a coastal embankment carrying a road. (The barrier, however, is composed of shingle and this may have been a natural lagoon originally, but is now embanked with a bridged inlet. Salinity at the time of sampling (27-28/7/02) from almost fresh (1.2 psu) at the inner most part, up to 32.6 psu near the tidal inlet.

Situated 5km east of Carrigaline and 1.5km south of Ringaskiddy in Cork Harbour. A small (2ha) artificial “estuarine” lagoon formed behind a causeway constructed for access to a petrochemical plant (Glaxo-Smith-Kline). Salinity is generally low, ranging at the time of sampling (Autumn 2005 to Spring 2006) from 2-18psu.

Bessborough Pond is located within the grounds of The Sacred Heart Convent, Blackrock, 4.5 kilometres to the south east of Cork City. The area covers just over 135 m² and lies at an average altitude of 9 metres above mean sea level. A very small (1ha) artificial lagoon apparently formed as part of an ornamental garden with five small islands. Hydrology of the pond may have been modified by construction of the new bypass south of Cork City. The pond is now largely stagnant but still receiving saline water through a pipe, and salinity measured 23.7psu at the time of sampling on 27/7/06.

Situated 6km east of Kinsale on the eastern shore of the Oyster Haven estuary. A small (3ha), shallow (<3m) artificial lagoon formed behind a coastal embankment carrying a road. Ranging in salinity at the time of sampling (19-20/8/02) from 6-15 psu.

Situated 1km southwest of Kinsale on the eastern shore of the River Bandon estuary. A moderate size (12ha), shallow, artificial lagoon created on saltmarsh behind a coastal embankment carrying a road, ranging in salinity at the time of sampling in August and September 2003 from 30.4-33.5psu.

Situated 2km south of Clonakilty. Two small artificial lagoons connected by a drainage channel, covering approximately 3ha, ranging in salinity at time of sampling (8-9/10/03) from almost fresh (0.1-6.2 psu) at the southern end of Clogheen Marsh to 27.7psu where tidal water enters White’s Marsh. Formed behind coastal embankments on reclaimed tidal flats.

Situated 2km southeast of Clonakilty on Inchydoney Island bordering Clonakilty Harbour. A small (2ha) artificial lagoon formed behind a coastal embankment carrying a road, ranging in salinity at the time of sampling (16-17/08/2002) from 33-35psu.

Kilkeran Lake  is a small (16ha), shallow (<3m) natural lagoon, lying behind sand hills on the south coast of Co. Cork , about 5 km east of the town of Rosscarbery and 2 km north of Galley Head. A channel leads from the lagoon 400 m to the shoreline where the water of the lake is impounded for most of the year by a short, coarse sand barrier, which the County Council periodically breach, but that also opens naturally, when water levels rise. The barrier closes again naturally, generally within a few weeks. Salinity is generally low, and measured 1-2psu when sampled in 1996.The lake has suffered from extreme eutrophication, and the once thriving trout fishery has now gone.

Situated 0.5km east of the town of Rosscarbery. A moderate sized (20ha), shallow (<3m) artificial lagoon created by construction of a causeway carrying a road across the inner part of an estuary, ranging in salinity at the time of sampling (20-21/7/02) from 12.5-15.3 psu.

Situated at Ballyrissode Bridge, 1km west of Toormore and 4km northeast of Goleen. A very small (<1ha) artificial lagoon formed behind a causeway carrying a road constructed across a tidal inlet, ranging in salinity at the time of sampling (22-23/10/05) from 19.8-30.3 32.6 psu.

Lissagriffin Lake is situated at the western end of the Mizen peninsula, 5 km west of Crookhaven. The lake lies at the landward end of a long sinuous tidal inlet and is partly artificial in that it now lies behind a causeway, but at the mouth of the inlet is a dune barrier through which the combined action of river and sea has cut a channel. The lake is very shallow (<2m) and seawater enters on all tides but a relatively large amount of fresh water also flows through the lake. Salinity at the time of sampling (29-31/7/96) ranged from 6-28psu.

Farranamanagh Lake is situated in Dunmanus Bay on the south side of the Sheep’s Head peninsula, 3 km east of Kilcrohane. The lake is a small (6ha), completely natural sedimentary lagoon lying behind a cobble barrier through which runs a permanent outlet. Small freshwater streams enter the lagoon in the north. On spring tides, seawater enters through the inlet and overtops the barrier during storms. Salinity ranged from 1-6psu at the time of sampling (17-18/8/96).

Situated 6km west of Durrus on the north shore of Dunmanus Bay, 2km east of Ahakista. A group of small (<1ha) natural sedimentary lagoons formed between two shingle/cobble barriers forming a spit which connects a small island to the mainland (tombolo). Salinity measured 8psu at the time of sampling (30/12/06).

Kilmore Lake is a natural sedimentary lagoon with a low cobble barrier. The lagoon is situated on the west coast of Whiddy Island, Bantry Bay, approximately 2 km to the west of the harbour. Seawater enters by percolation and by overflowing the low central part of the barrier, even on high water neap tides. The lagoon is small (c. 6 ha) and shallow (up to 3m) and with regular tidal flushing, salinity remains close to that of seawater, probably throughout the year, although 26 ppt was recorded near the barrier on 8/7/98 and salinity is always slightly lower at the northeast end where a small stream enters. Most of the central part of the lake consists of fine, muddy sand sediments with very little fauna.

Situated 4km east of Carrigaline and 2km west of Ringaskiddy in Cork Harbour. A small (4ha) artificial lagoon formed behind a coastal embankment. This lagoon is part of a landscaped golfcourse and has a relatively large permanent tidal inlet. Salinity is generally high, and measured 28 to 32psu. at the time of sampling (26-27/7/06).

Situated at the eastern end of Bantry Bay, 2km north of the town of Bantry. A moderate sized (25ha) natural sedimentary lagoon with an artificial unsluiced inlet. Apparently shallow (<3m) lagoon and very low salinity of <1psu at the time of sampling (6-7/07/02) although it is clear that a certain amount of seawater enters at times.