The west coast is poorly represented compared to the other three, and identification of the names Ptolemy gives is speculative. He begins with the Northern Promontory (see above), and working north to south names the river Rhawiu (possibly the Erne); the town Magnata (a settlement of the Magnatai people, possibly somewhere in County Sligo); the mouth of the rivers Libniu (possibly Clew Bay), Ausoba (perhaps Galway Bay) Senu (probably the Shannon, although placed too far to the north), Dur (possibly Dingle Bay) and Iernu (possibly the Kenmare), and the Southern Promontory (any one of Slea Head, Bray Head, Dursey Head and Mizen Head). Peoples of this coast are: the Erdinoi near Donegal Bay; the Magnatai or Nagnatai of County Mayo and Sligo; the Auteinoi between County Galway and the Shannon, identifiable with the early medieval Uaithni; the Ganganoi, also known in north Wales, and the Wellaboroi in the far south-west.