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A park system, also known as an open space system, is a network of open spaces which are connected by public walkways, bridleways or cycleways. In modern landscape practice, the park system concept is being overtaken by the idea of planning greenways which run through urban and rural areas. One of the earliest park systems, in London, came into existence more or less by chance. As London expanded round former royal parks in the nineteenth century, St. James's Park, Green Park and Hyde Park became part of the urban area. This arrangement was admired in France and adopted for the nineteenth century re-planning of Paris by Baron Haussmann. It was also admired by Frederick Law Olmsted and used to create the famous Emerald Necklace in Boston. In 1927, the Maryland-National Capital Park and Planning Commission was formed to plan and acquire parklands along stream valley corridors in the then-rural northern and eastern suburbs of Washington, D.C. Over 33,000 acres (130 km²) are now protected in the Montgomery County, Maryland, portion and provide welcome green space in this urbanized region. A major proposal for a park system was included in Patrick Abercrombie's 1943-4 County of London Plan. The largest continuous urban parks system in North America is the North Saskatchewan River valley parks system in Edmonton, Alberta, Canada, which is in size and in length, and also includes 22 ravines, which have a combined total length of .〔(【引用サイトリンク】 title=Ribbon of Green: North Saskatchewan River Valley and Ravine System Master Plan )〕 The largest urban parks system in Australia is the Western Sydney Parklands, which is in size and in length. ==See also== *Landscape architecture *Landscape planning *Greenway (landscape) *principles of Intelligent Urbanism 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「Park system」の詳細全文を読む スポンサード リンク
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