Ynys Moelfre (Moelfre Island) is a small island off the coast of Anglesey, Wales. At low tide it has a maximum length of 261 metres and a maximum width of 121 metres with a maximum area of 6.6 acres (27,000 m2). The nearest settlement to the island is the village of Moelfre, and the two are separated by a shallow channel called Y Swnt (The Strait or The Sound), which is never more than 194 metres wide and can at low tide only be waist-deep all the way across. Due to its proximity to the mainland there are grasses found on the island and a few wild flowers. Species of birds that can be found on the island include gulls, terns, gannets, fulmars, and Great/Arctic skuas. Porpoises are occasionally seen also. There are, however, no man-made structures. The island is found at 53°21′29.3″N 4°13′39.2″W and is referred to by some locals as Rat Island.