Ireland is now one of the least forested countries in Europe. Things were not always this way, Ireland was once covered in forest.
Before the last Ice Age a forest stood here. As the ice sheets moved across the landscape the forest was demolished. On this hilltop, above Loch Na Fooey, the stumps of the trees have been preserved in the peat bog that now covers the area.
During a summer warm spell the water level in this small lake has retreated a little and on the dry bed the ancient forest becomes visible once more.