Lake Alexandrina and Adelaide, Australia – March 24th, 2009
Lake Alexandrina is a lake in the state of South Australia, Australia, adjacent to the coast of the Southern Ocean, about 100 kilometres south-east of Adelaide (visible as a light grey area on the coast). Easily identifiable from its bright green color, the lake is north of Encounter Bay and east of Fleurieu Peninsula.
The major river flowing into Lake Alexandrina is the Murray River; others include the Bremer, Angas, and Finniss Rivers, all from the eastern side of the southern Mount Lofty Ranges. A narrow channel connects Lake Alexandrina to the smaller Lake Albert to the south-east.
Lake Alexandrina, which is shallow and contains a number of islands near the southern end, empties into the sea near Goolwa (the channel is known as the Murray Mouth). However, when the river flow is low the entrance is often blocked by a sand-bar.
Originally subjected to tidal and storm inflows of seawater the lake is now maintained as fresh water by a series of barrages across the islands near the Murray Mouth. This has produced an annual requirement for more than 1 million megalitres of fresh water to replace losses from evaporation that once came from sea water.