From another source:

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We known at least four castles named Castle of Dromore or Dromore Castle in the counties Down, Kerry, Limerick and Tyrone.
Several discussions on the Internet are dedicated to pinpoint the geological location of the lullaby Castle of Dromore without decisive outcome.

Without solid proof Dromore Castle, in County Tyrone is taking the lead. Clan Owen in the second verse refers to the descendants of Eoghan, anglicised in Owen or Eugenius. This clan once possessed the counties Tyrone, or Tir Eoghan, and Londonderry and parts of County Donegal. The presence of a Black Water in County Tyrone is circumstantial evidence as there are dozens of Black Waters on Ireland.
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I can't seem to find a map that indicates the path of Blackwater River near the town of Dromore in County Tyrone, nor can I find the location of this castle in county Tyrone.

My family has always believed the song was from Tyrone. Our research shows Edwd (Edward) Owens emigrated from Tyrone in 1840, in his early thirties, to Sussex, New Brunswick, Canada and subsequently obtained land on the Salmon River in Kent County. My father told me that my great-grandfather sang a song in Gaelic which he learned from his grandfather, Edward. This song was taught to my father and I learned it as follows :

**** NOW... PLEASE understand that my father came from a loooong line of teasers and tall tale tellers. It is not only possible, but HIGHLY probable, based on the above posts, that my old man was stringing me along. As a matter of fact, he told me that our name was "Owen" but that Edward was caught stealing sheep and the "s" was imposed on the end of our name to forever shame him and his offspring. Even though he left Ireland, the "s" could not be removed. Dad's version of "original sin", maybe? AND, I still have his LP "Hearty and Hellish by Tommy Makem and the Clancy Brothers. Hmmmm.****

Okay, here it is...

Castle of Dromore

The October winds lament around this Castle of Dromore,
Yet peace is in her lofty halls, my loving treasure store.
Tho Autumn leaves may droop and die, a bud of spring are you.
Sing hush-abye loo, la loo, lo-lan,
Sing hush-abye loo, la loo.

Bring no ill-wind to hinder us, my helpless babe and me,
Dread spirit of the Blackwater, Clan Owens' wild banshee.
And Holy Mary pitying us, in heaven for grace doth sue.
Sing hush-abye loo, la loo, lo-lan,
Sing hush-abye loo, la loo.

Allow time to thrive my ray of hope, in this garry of Dromore,
Take heed young eaglet til thy wings are feathered fit to soar.
A little rest, and then the world is full of work to do.
Sing hush-abye loo, la loo, lo-lan,
Sing hush-abye loo, la loo.

And, Dad told me that "Take heed young eaglet til thy wings are feathered fit to soar." meant "Don't fuck with the eagles til you learn to fly." Hmmm. Maybe it was a load of BS, but it's a good story.

Gary Owens