Fairmile Bottom is a biological Site of Special Scientific Interest north-west of Arundel in West Sussex. An area of is also a Local Nature Reserve.
This is an area of scrub and mature woodland with scattered species-rich chalk grassland. Yew is dominant over much of the woods but in some parts there is a high proportion of beech. According to Natural England there is an "outstanding diversity of beetles" and butterflies include the white admiral and the uncommon silver-washed fritillary.
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