Historically, the name "St Georges Channel" was used interchangeably with "Irish Sea" or "Irish Channel" to encompass all the waters between Ireland to the west and Great Britain to the east. Later[when?] it was restricted to the portion separating Wales from Leinster, sometimes extending south to the waters between the West Country of England and East Munster; the latter have since the 1970s come to be called the Celtic Sea. In Ireland "St George's Channel" is now usually taken to refer only to the narrowest part of the channel, between Carnsore Point in Wexford and St David's Head in Pembrokeshire. However, it remains common in Ireland to talk about a cross-channel trip, cross-channel soccer, etc., where "cross-channel" means "to/from Great Britain".
A 2004 letter from the St.George's Channel Shipping Company to Seascapes, an RTÉ Radio programme, said that St George's Channel bordered the Irish coast between Howth Head and Kilmore Quay, and criticised contributors to the programme who had used "Irish Sea" for these waters.
^Taylor, Isaac (1896). "St. George's Channel". Names and their histories, alphabetically arranged as a handbook of historical geography and topographical nomenclature. Rivington, Percival. p. 243. Retrieved 18 September 2010.
^Room, Adrian (2006). "St George's Channel". Placenames of the world: origins and meanings of the names for 6,600 countries, cities, territories, natural features, and historic sites. McFarland. p. 326. ISBN978-0-7864-2248-7. Retrieved 18 September 2010.