Cors Erddreiniog National Nature Reserve



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Cors Erddreiniog NNR is the largest of the Anglesey fens, located 3 miles west of Benllech on the northeast of the island, between the villages of Capel Coch and Brynteg. The reserve is of international importance due to the rarity of this type of wetland, and because of the huge range of wildlife to which it plays host. The area is home to many specialised plants like the fly orchid and the carnivorous sundew, and it also hosts a rich population of insects, especially butterflies, moths, damselflies and dragonflies. Butterflies include the rare marsh fritillary, one of the UK’s most threatened species. The fen also attracts a wide variety of birds and, in winter, you may see hunting hen harriers, or gatherings of lapwings. During the summer, birds such as willow tit can be seen, and, if you’re lucky, grasshopper warblers. Animals include toads, adders, otters, brown hares and water voles.

Cors Erddreiniog National Nature Reserve


About The area

Discover Isle of Anglesey

Some of the oldest rocks in Britain form the 125-mile coastline of the 85 square mile Anglesey Area of Outstanding Natural Beauty, which includes Holy Island with its busy port of Holyhead, the terminus for the Dublin ferry. The terrain inland is mainly a fertile plateau worn flat by the action of the sea, with low ridges and shallow valleys, while the sheer limestone cliffs of the east coast and on the north coast at Holyhead Mountain represent some of the most spectacular sea cliffs in Britain. 

On the steep northern and eastern cliffs, guillemots, choughs, cormorants and razorbills nest, while on the huge precipice of Gogarth Bay on lighthouse-topped South Stack (Ynys Lawd) on Holyhead Mountain, expert rock climbers now find their sport where local people formerly harvested gulls’ eggs from the vertiginous ledges.

Anglesey has a wealth of prehistoric remains. On the slopes of Holyhead Mountain, a collection of over 50 hut circles and rectangular enclosures, known as Cytiau’r Gwyddelod (Irishmen’s Huts), are thought to date from the Bronze Age and were still in use in Romano-British times, and many finds indicate the wealth of Iron Age culture on the island.

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