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A 14,000-year-old internationally rare habitat, the Lye Valley SSSI (Site of Special Scientific Interest) in Headington, Oxford, is a tufa-forming valley-head alkaline spring fen. This unique 4.5ha site, also a Local Nature Reserve, represents a significant portion of the mere 19 hectares of this type of habitat remaining in England and is a haven for biodiversity right within the city. Managed in part by the Friends of Lye Valley, its delicate ecosystem supports over 20 plant species rare in Oxfordshire, with 14 on the England Red List, including grass of Parnassus and southern marsh orchids. A boardwalk snakes through the valley, improving access for visitors to appreciate this precious remnant of ancient landscape and its unusual flora.
The Lye Brook, which gives the valley its name, was once the heart of a large boggy area. Today, this "wild" land is a sanctuary for an abundance of wildlife, including ten species of rare and 27 species of nationally scarce invertebrates like soldier flies and glow worms, alongside thriving populations of reptiles such as common lizards, slow worms, and grass snakes. The Friends of Lye Valley, in collaboration with Oxford City Council and volunteers, actively work to protect and preserve this site through regular working parties, fen improvements, and educational talks. These efforts focus on combating threats like erosion and maintaining the unique conditions necessary for the survival of its specialised plant and animal communities.
Monday: Open 24 hours; Tuesday: Open 24 hours; Wednesday: Open 24 hours; Thursday: Open 24 hours; Friday: Open 24 hours; Saturday: Open 24 hours; Sunday: Open 24 hours
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