|Type||Brackish seasonal groundwater|
|Primary outflows||groundwater; evaporation|
|Designation||Thomsons Lake Nature Reserve;|
Forrestdale and Thomsons Lakes Ramsar Site
|Max. length||1.6 km (0.99 mi)|
|Max. width||1.3 km (0.81 mi)|
|Surface area||5.38 km2 (2.08 sq mi)|
|Surface elevation||12 m (39 ft)|
Thomsons Lake Nature Reserve is a lake nature reserve around Thomsons Lake in the City of Cockburn, Western Australia, approximately 25 kilometres (16 mi) south of the central business district of Perth, the state capital, and on the southern fringes of the Perth metropolitan area. It is in the suburb of Beeliar, 7 kilometres (4.3 mi) south-west of Jandakot Airport. It is a still largely natural wetland, with adjoining native vegetation, surrounded by land developed for housing and agriculture, that regularly supports large numbers of shorebirds and other waterbirds.
The lake is listed on the Register of the National Estate. With the similar Forrestdale Lake 10 kilometres (6.2 mi) to the east, it forms the Forrestdale and Thomsons Lakes Ramsar Site, designated under the Ramsar Convention on 7 June 1990 and recognising it as a wetland of international importance. The lake and its surrounds are registered as Nature Reserve 15556, vested in the Conservation Commission of Western Australia and managed by the Department of Conservation and Land Management. The reserve is also part of the Beeliar Regional Park.
Thomsons Lake Nature Reserve, including the lake and adjacent woodland, has an area of 538 hectares (1,330 acres). The lake is a shallow, brackish, seasonal lake with a large area of open water when full. It has extensive fringing sedgeland typical of the Swan Coastal Plain, and is a major breeding site, migration stop-over and semi-permanent drought refuge area for waterbirds. It usually dries out during the summer, though occasionally retaining some water through the year. It is fenced to exclude feral predators. It is mainly used for birdwatching, nature walks, and general recreation by surrounding residents. Within the reserve there is a network of fire-breaks and management access tracks used for bushwalking, while horse riding is only allowed on a perimeter track outside the vermin-proof fence.
The lake occupies a depression between two dune systems – the Bassendean System to the east, and the younger Spearwood System to the west. These dunes are the result of the accumulation and subsequent distribution of beach sands along successive shorelines from a series of marine incursions combined with the prevailing westerly winds. Palaeobotanical studies show that the lake sediments are 30–40,000 years old, making them the oldest found in Western Australia.The lake lies on the Jandakot Groundwater Mound - a region of elevated groundwater beneath the Swan Coastal Plain.
Water milfoil grows abundantly in the lake. The fringing zone around the edge is characterised by the introduced bulrush Typha orientalis and the sedge Baumea articulata . When water levels drop, the club-rush Bolboschoenus caldwellii becomes established on the exposed mudflats within the fringing zone, while behind it is a belt of Baumea juncea and Baumea articulata with emergent native broom and shrubs of orange wattle. Behind these is a belt of the trees flooded gum and stout paperbark, and the shrub grey stinkwood. On higher ground these are replaced by open forest or woodland dominated by jarrah, firewood banksia and candlestick banksia. Some 476 vascular plants (including 133 introduced weeds) from 81 families have been recorded in the reserve.
The lake is one of the last refuges for the endangered Australasian bittern on the Swan Coastal Plain; it is the only wetland in the Perth metropolitan area where the marsh harrier still breeds, and one of few known breeding sites for Baillon's crake. It regularly supports more than 1% of the national population of four shorebirds: red-capped plover (with up to 1,000 counted), black-winged stilt (3,000), red-necked avocet (3,000), and curlew sandpiper (2,500). The lake often holds more than 10,000 waterbirds, with the highest number counted over 20,000. The most numerous are Australian shelduck (with up to 1,600 counted), Pacific black duck (4,500), grey teal (6,000), Australasian shoveler (2,000), and Eurasian coot (7,000). The reserve contains a population of western grey kangaroos. The long-necked tortoise is present. Six frog species and up to 80 aquatic invertebrate taxa have been recorded.
Yalgorup National Park is a national park in Western Australia, 105 km south of Perth, and directly south of Mandurah
Forrestdale is a suburb of Perth, Western Australia, located within the City of Armadale. It is named after John Forrest the first premier of Western Australia
Atwell is a suburb within the metropolitan area of Perth, Western Australia, situated 21 kilometres (13 mi) south of Perth City, and located in the City of Cockburn local government area.
The Swan Coastal Plain in Western Australia is the geographic feature which contains the Swan River as it travels west to the Indian Ocean. The coastal plain continues well beyond the boundaries of the Swan River and its tributaries, as a geological and biological zone, one of Western Australia's Interim Biogeographic Regionalisation for Australia (IBRA) regions. It is also one of the distinct physiographic provinces of the larger West Australian Shield division.
The Beeliar Wetlands are made up of two chains of lakes and wetlands that run parallel to the west coast of Western Australia. They are situated on the Swan Coastal Plain between the Darling Escarpment and the Indian Ocean. Beeliar was the name given to the area by the Aboriginal people that lived and hunted in the area.
The Gnangara Mound is an area north of Perth, Western Australia where a large mound of sandy soil reaches an elevation of about 60 metres (200 ft). It stores about 20 cubic kilometres of fresh water, about one hundred times Perth's current annual water usage. It is currently the single most important source of potable water for the city. Together with the Jandakot Mound south of Perth it supplies about 35%-50% of the city's drinking water.
Forrestdale Lake Nature Reserve is a lake nature reserve around Forrestdale Lake in the City of Armadale, Western Australia, approximately 25 kilometres (16 mi) south of the central business district of Perth, the state capital, and on the southern fringes of the Perth metropolitan area. It lies immediately south of the suburb of Forrestdale, and 8 kilometres (5.0 mi) south-east of Jandakot Airport. It is a still largely natural wetland, with some adjoining native vegetation, surrounded by land developed for housing and agriculture, that regularly supports large numbers of shorebirds and other waterbirds.
Lake Warden is a salt lake in the Goldfields-Esperance region of Western Australia. It and its associated wetlands are protected in a nature reserve; they were recognised as being of international importance under the Ramsar Convention through designation of the Lake Warden System on 7 June 1990 as Ramsar Site 485. The lake is also a DIWA-listed wetland.
Lake Gore is a seasonal and semi-permanent freshwater lake in the Goldfields-Esperance region of Western Australia located approximately 24 km (15 mi) west of Esperance. It is an important site for waterbirds.
The Vasse-Wonnerup Estuary is an estuary in the South West region of Western Australia close to the town of Busselton. The estuary is listed with DIWA. It was also recognised as a wetland of international importance under the Ramsar Convention on 7 June 1990 when an area of 1,115 ha was designated Ramsar Site 484 as an important dry-season habitat for waterbirds. It is also the main part of the 2,038 ha (5,040-acre) Busselton Wetlands Important Bird Area.
The Port Phillip Bay and Bellarine Peninsula Ramsar Site is one of the Australian sites listed under the Ramsar Convention as a wetland of international importance. It was designated on 15 December 1982, and is listed as Ramsar Site No.266. Much of the site is also part of either the Swan Bay and Port Phillip Bay Islands Important Bird Area or the Werribee and Avalon Important Bird Area, identified as such by BirdLife International because of their importance for wetland and waterbirds as well as for orange-bellied parrots. It comprises some six disjunct, largely coastal, areas of land, totalling 229 km2, along the western shore of Port Phillip and on the Bellarine Peninsula, in the state of Victoria. Wetland types protected include shallow marine waters, estuaries, freshwater lakes, seasonal swamps, intertidal mudflats and seagrass beds.
Toolibin Lake is a seasonal fresh to brackish water perched lake or wooded swamp, in south-western Australia. The lake is contained with a 493-hectare (1,218-acre) nature reserve and it is located about 200 kilometres (124 mi) south-east of Perth, in the Shire of Narrogin, and 40 kilometres (25 mi) east of the town of Narrogin, in the Wheatbelt region of Western Australia. The lake is listed by the Australian Government as a threatened ecological community under the Environment Protection and Biodiversity Conservation Act 1999.
The Becher Point Wetlands site is a wetland nature reserve in Port Kennedy on the Swan Coastal Plain of south-western Western Australia. The 677-hectare (1,670-acre) coastal site lies in the City of Rockingham, about 50 kilometres (31 mi) south of the state capital,, and is largely surrounded on the landward side by residential suburbs. It comprises about 200 very small wetlands among sand ridges between Becher Point the Perth-Mandurah Road.
The Jandakot Mound, or Jandakot Groundwater Mound, is an unconfined aquifer in south-western Western Australia. It is the smaller of the two main shallow aquifers near Perth that together supply about 40% of Perth's drinking water. Its highest point lies about 18 km (11 mi) south of Perth’s central business district. It stretches from the Swan River in the north to the Serpentine River in the south, and from the Indian Ocean in the west to the Darling Scarp and Southern River in the east, covering an area of about 760 km2 (290 sq mi).
The Forrestdale and Thomsons Lakes Ramsar Site comprises two separate nature reserves, totalling 754 ha in area, protecting two shallow fresh to brackish, seasonal lakes in a suburban and agricultural landscape in south-western Western Australia. It lies in the Swan Coastal Plain bioregion and is used mainly for birdwatching and walking. The site is recognised as being of international importance under the Ramsar Convention on Wetlands, under which it was designated Ramsar Site 481 on 7 June 1990.
The Perth Wetlands, also known as the Perth Great Lakes or the Great Lakes District, was a collection of fresh-water wetlands, swamps and lakes located on the Swan Coastal Plain north of the city of Perth in Western Australia. Over a period of 80 years from the first British settlement in Western Australia in 1829 most of the wetlands were reclaimed for use as housing, parks and market gardens.
Benger Swamp is a wetland located on the Swan Coastal Plain, in south-west Western Australia.
Lake McLarty is a 219-hectare (540-acre) freshwater lake and associated nature reserve on the Swan Coastal Plain of Western Australia. The lake is named after a prominent pioneering family which settled in the district in the early 1860s. It lies about 90 kilometres (56 mi) south of Perth on the eastern side of the Harvey Estuary and forms part of the Peel-Yalgorup System Ramsar site. It is an important area for waders, or shorebirds, and is a well-known birdwatching site.
The Yalgorup Important Bird Area comprises a group of parallel, linear wetlands, with a collective area of 59 km2, on the Swan Coastal Plain of south-west Western Australia between the cities of Mandurah and Bunbury. It is an important site for waterbirds.
Shark Lake is a freshwater lake in the Goldfields-Esperance region of Western Australia approximately 13 kilometres (8 mi) north of Esperance.