Doagh Island is situated on the route from Ballyliffin to Carndonagh. This was an island until after the Ice Age, when melting ice left the sea at more than 50 meters below the present level. 6,000 years ago it was again an island to the main-land and wave action pushed ashore sand which was blown into dunes. There are records showing the Isle of Doagh itself inhabited as far back as the early 9th Century. The Isle of Doagh (BarMouth or Lagg) is a wonderful location for sea trout fishing, spinning or free lining sand eel from both sides of the channel.