Dundalk County Louth Dundalk County Louth Dundalk is a large town in County Louth where the Castletown River enters the sea. The large tidal estuary makes it one of the best birdwatching locations on the east coast of Ireland. Lesser Black Backed GullLittle EgretTeal (Male)Teal (Female)RuffGolden PloverRedshankBlack Headed GullLesser Black Backed GullLapwingDunlinReed BuntingLapwingGrey HeronBlack Headed GullHouse SparrowRed Breasted MerganserShellduckSpotted RedshankForsters TernCormorant