The limestone pavement of this fine hilltop reserve is some of the best to be found in Wales. It is being carefully managed to sustain North Wales' strongest populations of the threatened Pearl-bordered Fritillary butterfly.


Eyarth Rocks Reserve Leaflet

Species to look out for


    • Pearl-bordered Fritillary
    • White-letter Hairstreak
    • Grizzled Skipper
    • Dingy Skipper
    • Dark Green Fritillary
    • Brown Argus                                            
    • Common Blue                                          
    • Small Pearl-bordered Fritillary

    Notable plants

    • Mountain Melick
    • Moonwort
    • Hound's-tongue
    • Greater Butterfly Orchid


    The Eyarth Rocks reserve is part of Craig-adwy-wynt, one of the richest butterfly sites in North Wales;  32 of the 34 species known to occur in the region have been recorded on this limestone hill-top Site of Special Scientific Interest (SSSI) and most breed there.

    The population of Pearl-bordered Fritillary has grown strongly since 2002 when BC bought and started managing the site. The limestone pavement flora is exceptional and the site provides magnificent views of the area.

    Sheep are grazed on the reserve to help control the scrub growth and break up the bracken cover so that more violets can flourish for the Pearl-bordered Fritillary caterpillars to eat.

    Area: 8.4 hectares



    Grid Reference:     SJ 122 540

    Ordnance Survey:  Landranger 116 ac Explorer 256

    Nearest town:         Ruthin, Denbighshire

    Eyarth Rocks reserve is about 4.5 km south of Ruthin in Denbighshire, centred on map reference SJ 122 540

    To reach the reserve: There is limited roadside parking at Eyarth Bridge SJ 313 355. Postcode LL15 2NT for SatNav - but note this covers a wide area. 

    From Eyarth Bridge follow the public footpath southwest along the old railway line and up through woodland. At the stile walk up the field to the stile ahead on the right. Cross the lane and follow the path behind the house then take a right into the open clearings. Keep following the path up the cliff to another stile and onto the Reserve.

    By bike: It is about 18 miles by road from Wrexham railway station. 

    By Bus: For buses from Ruthin to Eyarth Bridge please check a website such as Traveline Cymru to get up to date information.


    Site access and safety

    Our suggested access routes involve walks of about 1 km, moderately steep in places, up from the scenic river Clwyd valley. The ground can be uneven and requires strong footwear. The limestone pavement surfaces comprise a myriad of ‘clints’ and ‘grikes’ - narrow crevices that catch the feet of unwary walkers. Please take great care on the western side of the reserve where there is an unfenced cliff edge.

    The hill fort remains are on neighbouring private land, not the reserve.

    Most ticks are little more than an irritation, but a few can transmit Lyme disease, a rare and potentially serious illness which is treatable with antibiotics if diagnosed early. It is therefore important to be informed and take some simple precautions


    Russel Hobson, Head of Conservation - Wales

    • email: @email
    • tel: 01792 642972 or 07736 229593