The estuary can hold up to 1,500 Wigeon in winter, along with smaller numbers of other wildfowl species such as Greylag and Canada Geese, Teal and Mallard. Waders are also present in good numbers. Harlech beach can hold good numbers of Slavonian Grebe, with a possibility of Black-necked Grebe. An extensive area of sand and mud extending along the Menai Straits from Bangor to Llanfairfechan, part in Conwy and part in Gwynedd. Most of the area is now a series of nature reserves.
Access is possible at several points.
There is a hide here, and you can follow the path in either direction along the shore. Park at the car park at the shore. Note that you can walk all along the shore from Llanfairfechan to Aber Ogwen, though parts may be impassable at high water on the highest tides, and you may cause disturbance to roosting waders. Traeth Lafan holds up to 6,000 Oystercatchers in winter, with the main roost on the spit opposite the Morfa Madryn Reserve. There are notable numbers of Red-breasted Merganser and Great Crested Grebe in this area in late summer and autumn, with over 300 of both species recorded.