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Ord River Floodplain
The Ord River floodplain is the floodplain of the lower Ord River in the Shire of Wyndham-East Kimberley, in the Kimberley region of northern Western Australia. It lies within the Victoria Bonaparte IBRA bioregion and contains river, seasonal creek, tidal mudflat and floodplain wetlands, with extensive stands of mangroves, that support saltwater crocodiles and many waterbirds. It is recognised as an internationally important wetland area, with 1,384 km2 of it designated on 7 June 1990 as Ramsar Site 477 under the Ramsar Convention on Wetlands.
==Description==
The site lies about 8 km east of the town of Wyndham, extending from to . It comprises the Ord River and Parry Lagoons nature reserves, with some additional land. It lies downstream of two large impoundments on the Ord River, Lakes Argyle and Kununurra, which have had a major impact on the river’s hydrology through changing its flow pattern so that there are now constant flows through the dry season. In effect, the lower Ord has been transformed through flow regulation at the dams from a ‘dry tropics’ to a ‘wet tropics’ river.〔Information Sheet on Ramsar Wetlands: Ord River floodplain.〕
The southern part of the site is dominated by Parry Creek, including 20 km of seasonal creek and an alluvial floodplain which is flooded during the wet season. It dries out quickly in the dry season, except for waterholes associated with incised channels and claypans. The southern, or upstream, part of the floodplain is freshwater, while the northern, or downstream part, is either regularly flooded with saltwater or contains saline soils.〔
The lower reaches of the Ord River extend from the Parry Creek floodplain northwards to the Cambridge Gulf. The upper reaches of the Ord River are permanently fresh; the lower reaches, when not in flood, become saline due to the tidal cycle which, at the coast, has an amplitude of up to 8 m. Within the site the upstream end of the river channel is around 150 m wide with broad sand and gravel spits, while unstable mud bars and islands characterise the 5 km wide mouth. From the mouth of the Ord River, the site extends northwards around the coast to include the False Mouths of the Ord, consisting of a maze of deltaic channels, intertidal mudflats and low muddy islands, an area which receives only a little fresh water from small and ephemeral creeks.〔
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