Coed Cyrnol is a woodland Local Nature Reserve which is situated in the town of Menai Bridge. It is accessible from the A5 (Mona Road), and parking is available at a public pay and display car park at the main reserve entrance. The main habitats are broadleaved woodland and scrub.

Church Island – a small island with an ancient church and cemetery - lies to the west of the woodland and is connected to it by a causeway. At the bottom of the main path from the car park, the Belgian Promenade follows the line of the shore to the south east, in the direction of the Menai Suspension Bridge. There are spectacular views from here of the swirling Menai Strait, and the mountains of Snowdonia and the Carneddau.

The reserve is directly accessible from the Anglesey Coastal Path. The woodland is dominated by mature Scots pine, with an under-storey of young oak, beech, sycamore, rowan, birch, hazel, holly and yew. Coed Cyrnol hosts a rich assemblage of woodland birds, with resident species including coal tit, long-tailed tit, tree creeper, tawny owl and great spotted woodpecker. Some of the summer visitors are blackcap, chiff chaff, spotted flycatcher and willow warbler.

You may hear wood warbler and pied flycatcher singing in the spring. Siskins are regular visitors to the pines and may have bred, and crossbills have also been recorded. The island in the Straits off Church Island is known as Ynys Welltog. This island is a breeding site for greylag geese, oystercatchers and herons. Little egrets are known to breed in the area and are quite conspicuous in their bright white plumage.

The Belgian Promenade and Church Island are good places from which to see sea birds and waders. Red squirrels are known to frequent the woodland, and grey seals are occasionally seen in the Straits.