Gaelforce Great Lake Swim

In Irish mythology, the vast expanse of Lough Derg is known as 'Loch Deirgdheirc', or the 'red eye', a title linked to the ancient deity The Dagda. As you prepare to enter these waters, you are not merely starting a race; you are navigating a landscape steeped in cultural lore that has defined this crossing point for centuries. The Gaelforce Great Lake Swim, held annually each July, invites swimmers to test their resolve across distances of 750m, 2km, and 3.9km, finding rhythm in a lake that once served as a silent witness to the migration of the 'Wild Geese'—the Irish soldiers and nobility who departed their homeland for the continent in the late 17th century.

What you'll see

As you sight your line, the ruins of the 15th-century Portumna Abbey emerge on the northern shore, where a 35-meter-long church remains marked by a distinct tower separating the nave from the chancel. Further along the course, the skeletal structure of Portumna Castle commands the shoreline. This semi-fortified Renaissance manor, built between 1610 and 1617, once stood as the grandest residence in the region before the fire of 1826 left its stone shell as a permanent feature of the skyline. On the northeastern side of the lake, the remnants of the 13th-century Terryglass Castle—a keep established by the Marshall family atop the foundations of a 6th-century monastery—provide a stark architectural contrast to the surrounding forest.

Race day logistics

The atmosphere in Portumna is one of focused endurance, a far cry from the chaotic 'Port-mud-na '85' event when torrential rains turned the local scout jamboree into a legendary quagmire. Today’s event is meticulously managed, ensuring safe conditions for both wetsuit and non-wetsuit swimmers as they traverse the calm, deep waters of the Shannon's largest lake. Whether you are aiming for the shorter 750m sprint or the full 3.9km challenge, the focus remains on the experience of moving through a corridor of history. The event is designed for those who appreciate the intersection of natural beauty and human legacy, allowing you to trace the same routes once traveled by river craft and historical figures while you focus purely on your stroke.