Which preposition to use with townland

of Occurrences 3%

Of these the best known is Relig Deaglain, a disused graveyard and early church site on the townland of Drumroe, near Cappoquin.

on Occurrences 1%

The settlers, though shut out of the back country, did, however, hold the townland on which they had squatted, and which is now the site of Wellington, the capital of New Zealand.

Which preposition to use with  townland