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|Location||Lake District, Cumbria|
|Basin countries||United Kingdom|
|Surface area||280 acres (1.1 km2)|
|Average depth||6.4 m (21.0 ft)|
|Max. depth||15.5 m (50.9 ft)|
|Residence time||0.26 years|
|Surface elevation||65.3 m (214 ft)|
|Designated||7 November 1991|
Esthwaite Water is one of the smaller and lesser known lakes in the Lake District national park in northern England. It is situated between the much larger lakes of Windermere and Coniston Water, in the traditional county of Lancashire; since 1974 in the administrative county of Cumbria. To the north is the village of Hawkshead and to the west is Grizedale Forest.
The lake was mentioned as the location where William Wordsworth conversed with a friend in Wordsworth's poem, "Expostulation and Reply," part of Wordsworth's Lyrical Ballads and, in the same collection, it is the location for "Lines Left Upon A Seat In A Yew-Tree." Wordsworth also mentions it in his Prelude in line 267: "Make green peninsulas on Esthwaite's Lake", and also at line 570: "From Esthwaite's neighbouring lake the splitting ice".
'Esthwaite' is "probably either (a) 'the eastern clearing', with ME 'e(a)st', probably replacing ON 'aust(r)' 'east', and ON 'þveit' 'clearing'...or (b) 'the clearing where ash trees grow', from ON 'eski' 'ash trees, ash copse' (see 'askr') and again 'þveit'."  Whaley also mentions an outside possibility that the Cunsey Beck, which flows out of Esthwaite Water may previously have been called 'Ystwyth' 'agile one', a Brittonic word.
'Water' is "'wæter' OE, 'water' ModE, the dominant term for 'lake'..."
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