Finn , Foyle or Erne
The River Nile has only four letters.
Unuk River
The river Main. May end in s
do you mean "ulster"? Ireland is split into 4 provinces connaght, leinster, munster and ulster. the ulster Irish are the Irish from ulster
Oder
aare
Bath.
You are referring to the Blackwater. There is more than one river in Ireland called the Blackwater. So you can find a Blackwater in Meath and in Ulster and in Munster.
Ulster is 1 of 4 provinces in the Island of Ireland
it is ORNE
urge
ural