Errigal is a 751-metre mountain near Gweedore in County Donegal, Ireland. It is the tallest peak of the Derryveagh Mountains and the tallest peak in County Donegal. Errigal is also the most southern and the highest of the mountain chain called the "Seven Sisters" by locals. Wikipedia
located by the River Robe. A large cut stone industrial mill, it has multiple bays and is seven stories high and built c 1800 on the site of an earlier mill.
Info courtesy of the Historical Ballinrobe website