Ireland's southwest coast — where the Celtic Sea meets the open Atlantic off Cork and Kerry — is one of Europe's premier autumn seabird passage routes. Trips from Baltimore (Co. Cork) and Ventry Pier (Co. Kerry) chum offshore for Manx Shearwater rafts reaching the tens of thousands alongside Sooty, Great, and Cory's Shearwaters, with Wilson's Storm-Petrel now a near-guaranteed July–August species and Leach's Storm-Petrel following in autumn. All four skua species and Sabine's Gull are regular, the Critically Endangered Balearic Shearwater appears reliably from August, and Red-necked Phalarope and rarities including Ireland's first South Polar Skua highlight the route's vagrant potential.