A few more words based on what I know of Leitrim:

Verse 3 line 2 = sweet Dromahaire

Verse 4 line 2 Sliabh-an-Iarainn

I'm not sure about line 3 - it sounds like "luminous cross" and a cross was put up in 1954 (Marian Year) at Fivemilebourne but I know no more about it.

Verse 5 line 3; "Go on to Seltan, that hill of renown"
Site of an ambush by British troops during the Wars of Independence

Verse 6 line 2 = St Caillin - founder of Fenagh

Verse 7 line 2 = Lough Allen...Melvin and Bran