Dunaff (Irish: Dún Damh) is a townland in the Urris Valley, located in the North-West corner of the Inishowen Peninsula.

It is in the Electoral Division of Dunaff, in Civil Parish of Clonmany, in the Barony of Inishowen East, in County Donegal.

The location is regarded as an "industrial site" producing material associated with the so-called Early Larnian tradition.

The explosion caused severe injuries, leading to the amputation of his right hand and forearm, as well as fracturing bones in his skull.

Expert testimonies from Lieutenant Long of the Royal Garrison Artillery and Chief Gunner Frederick William Philmore from Lough Swilly Naval Base confirmed that the shell in question was a three-pounder of British origin.