Eisgir Riada
[Irish eiscir, esker, (glacial) ridge; riada, to travel by horse or chariot]
Traditional boundary dividing Ireland into two halves, north and south, running along a series of low sandhills from Galway Bay to Dublin. In the pseudo-history Lebor Gabála [Book of Invasions], Éber Finn takes the north; Éremón takes the south. Elsewhere in early Irish tradition the northern portion is Leth Cuinn, or Conn's half, attributed to Conn Cétchathach [of the Hundred Battles], and the southern is Leth Moga, or Mug's half, for Mug Nuadat, better known as Eógan Mór.
