This map plots the settings and references in The Day of the Triffids

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Page 254. " It had been chiefly climate that had decided them in favour of the Isle of Wight "
The Isle of Wight
Creative Commons AttributionThe Isle of Wight - Credit: Cristian Bortes
As one of the most southerly points of Britain, the Isle of Wight has a milder climate than most of the country, making it popular with holidaymakers.  It is separated from the mainland by the Solent, a stretch of water 2-4 miles wide.