Close to Lough Derg is Beal Boru, a prehistoric site dating back to the Iron Age. Lost in the middle of the forest, more than 800 stone tools were found there. A high place in Irish history, which King Brian Boru is said to have appropriated the name!
Although often ignored by tourists, this site is really worth the detour! Composed of a ringfort, several hundreds of stone tools, including axes, hammers, etc., are said to have been found there.
The fort can be found by taking a grassy path halfway between the road to Killaloe and Scarrif. You will recognize it by its grassy mound. Be careful not to damage it.
A nice, quiet and charming place!