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Silent Pool is a spring-fed lake at the foot of the North Downs, about east of Guildford in Surrey. It is managed together with the nearby Newlands Corner by the Surrey Wildlife Trust, within the privately owned Albury Estate.〔(【引用サイトリンク】title=Newlands Corner & Silent Pool )〕 The outflow from Silent Pool runs into a second, adjacent, lake, Sherbourne Pond, created in the mid-seventeenth century. In turn the outflow from the Sherbourne Pond feeds the Sherbourne Brook, a tributary of the Tilling Bourne. Silent Pool is considered by some to be a sacred site. It is linked to a folklore tale that says King John on his horse abducted a woodcutter's daughter who was forced into the deep water and drowned. According to the legend, the maiden can be seen at midnight. In December 1926, when crime writer Agatha Christie infamously disappeared, it was feared that she had drowned in the Silent Pool after her car was discovered at nearby Newlands Corner. The lake was admired by the poet Alfred Tennyson. ==Geology== The Silent Pool Spring is the only major spring source in the -long scarp slope of the North Downs between the Wey and Mole valleys. It discharges between 1 and 10 megalitres (220,000 to 2.2 million gallons) per day into Silent Pool; and the lake water exhibits a blue ''opalescence'' characteristic of chalk spring-fed ponds. In prolonged dry periods, Silent Pool has been known to dry up, although the lower Sherbourne Pond has not. The Silent Pool lies on Lower Chalk, observable at the northern end of the pond. Sherbourne Pond lies mainly on Gault clay, while its northern end and the stream connecting the two ponds lies on Upper Greensand. Blocks of the Upper Greensand can be found in the stream bed: a pale grey siltstone which weathers to brown and is harder than the chalk.〔(【引用サイトリンク】title=Newlands Corner-Albury Geology Trail led by Iain Fletcher )〕 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「Silent Pool」の詳細全文を読む スポンサード リンク
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