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Oldfield Estuary is an estuary in the Goldfields-Esperance region of Western Australia.
The estuary has a length of 3 kilometres and is no wider than 600 metres with a total area of approximately 1 square kilometre. The estuary has a main basin area of about 0.5 square kilometres and the rest is flood and tidal delta.
The Oldfield River and the Munglinup River both discharge into the estuary.
Uncleared bushland surrounds the estuary which has high dunes to the east and low sediments to the west.The lagoon is filled with river sediment to the north and beach sand to the south with a long high sandbar that breaks every three to four years.
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