Location.

Loch a'Dúin is located just past Ventry village on Slea Head Drive along the Wild Atlantic Way.
Here is a link to the exact loaction of Loch a'Dúin on Google Maps
In the picture below you can see the map location at the bottom and a photo of Ventry Beach at the top, with Loch a'Dúin pinpointed on each in red.