Old Warden Tunnel nature reserve is a 3.8 hectare nature reserve near Old Warden in Bedfordshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. The site is on top of a disused railway tunnel, Old Warden Tunnel. The site has oak and ash woodland with mature blackthorn and hawthorn bushes, and a steep cutting with grassland and scrub. Flowers include dwarf thistle and pyramidal orchid, and the scrub provides nesting sites for birds. There is access by a track from Southill Road.
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