The man, who is believed to be a holidaymaker from Derry, was last seen at a pier on the smallest of the three Aran Islands.
Helicopter, lifeboat and coastguards, as well as gardaí and islanders, were taking part in the search.
Updated: 17:06, Monday, 13 July 2009
A search resumed this morning on the west coast island of Inis Oírr for a man in his 40s who was last seen on Saturday night.
The man, who is believed to be a holidaymaker from Derry, was last seen at a pier on the smallest of the three Aran Islands.
Helicopter, lifeboat and coastguards, as well as gardaí and islanders, were taking part in the search.