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The Helena River is a tributary of the Swan River in Western Australia. The river rises in country east of Mount Dale and flows north-west to Mundaring Weir, where it is dammed. It then flows west until it reaches the Darling Scarp. It passes through the western edge of the Darling Scarp between Gooseberry Hill, and Greenmount Hill before joining the Swan River at the southern edge of the historic town, now suburb, of Guildford. == Catchment area== Many of the tributaries of the Helena River are unnamed due to their seasonality and size. However, on the northern side of the catchment Nyaania Creek and on the southern side Piesse Brook are significant in their moving through built up areas which makes them susceptible to urban environment issues. Upper Helena catchment (i.e. above Mundaring Weir) has on the north side of Lake C.Y. O'Connor (formerly the Helena River Reservoir) a range of named creeks that occur in State Forest no 71 and 13: *Manns Gully *Chinaman Gully *Jones Gully *Michael Gully *Chauncy Gully *Middle Brook *Helena Brook *Hancock Brook *Emu Brook *Warin Brook 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「Helena River」の詳細全文を読む スポンサード リンク
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