The Irish Sea (Irish: Muir Éireann or Muir Meann,Scottish Gaelic: Muir Èireann or Muir Mhanainn,Manx: Mooir Vannin or Y Keayn Yernagh,Welsh: Môr Iwerddon, Scots: Erse Sea) separates the islands of Ireland and Great Britain. It is connected to the Celtic Sea in the south by St George's Channel, and to the Atlantic Ocean in the north by the North Channel. Anglesey is the largest island within the Irish Sea, followed by the Isle of Man. The sea is occasionally, but rarely, referred to as the Manx Sea.

The sea is of significant economic importance to regional trade, shipping and transport, fishing, and power generation in the form of wind power and nuclear plants. Annual traffic between Great Britain and Ireland amounts to over 12 million passengers and 17 million tonnes of traded goods.

The International Hydrographic Organization defines the limits of the Irish Sea (with St George's Channel) as follows:

On the North. The Southern limit of the Scottish Seas [or Inner Seas off the West Coast of Scotland, defined as "a line joining the South extreme of the Mull of Galloway (54°38'N) in Scotland and Ballyquintin Point (54°20'N) in Ireland"].

Christopher Todd (born 22 August 1981 in Swansea), is a Welsh professional footballer currently playing for Forest Green Rovers.

Todd, a central defender, began his career as a trainee with his home town club, Swansea City, turning professional in August 1999. He made his debut on 10 March 2001 at home in a 1–1 draw with Northampton Town, going on to make 46 appearances before being released in June 2002.

He then moved to Republic of Ireland, joining Drogheda United, before returning to English football with Exeter City in January 2003. Although he was unable to prevent Exeter being relegated from the Football League that season, he remained with the club, and was consistently a first-team regular.

Upon Glenn Cronin's departure during the 2006 off-season, Todd was appointed captain of Exeter City for the 2006–07 season.

Todd joined local rivals Torquay United in June 2007 for a fee of £7,500. and quickly became a regular in the newly-relegated Conference National side.

On 19 November 2008, it was announced that Todd had been diagnosed with chronic myeloid leukaemia With his treatment going well, Todd returned to training and in on 2 February 2009 joined Salisbury City on loan in order to regain match fitness.