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Oldfield Estuary is an estuary in the Goldfields-Esperance region of Western Australia. The estuary has a length of and is no wider than with a total area of approximately .〔(【引用サイトリンク】title=South Coast Rivercare - Oldfield Estuary ) 〕 The estuary has a main basin area of about and the rest is flood and tidal delta.〔(【引用サイトリンク】title=Estuary Assessment Framework for Non-Prisitne Estuaries - Estuary 885 Oldfield Esutary )〕 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. The estuary functions primarily as a result of wave energy. The sea grass ''Ruppia Megacarpa'' is found in the estuary. The catchment area of the estuary is 30% natural vegetation and 70% cleared for cropping and pasture. The waters of the estuary are saline and heavily tannin stained.〔(【引用サイトリンク】title=Australian Natural Resources Atlas - Estuary Assessment 2000: Western Australia )〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oldfield Estuary」の詳細全文を読む スポンサード リンク
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