This unique event brings swimmers and runners from all over the country to the edge of the Snowdonia National Park in North Wales – Expect wild weather, wide open spaces, a stunning landscape and a tidal push that is into bore category. This Autumnal celebration embraces the change of the seasons: bring on the firepits, blackberries, pumpkins, gorse and empty beaches. Skin swimmers welcome.The 11K run takes place at the same time as the swim, so at some point in the course you will see swimmers in the estuary beside you. The route will take you from Barmouth Beach, over the iconic Barmouth bridge then flanks the estuary all the way to Penmaenpool. Perfect for supporters who might not be water lovers but would like to get in on the action.A 11K run followed by the 10K swim for those of you keen for a double challenge. You will be bused to Penmaenpool to join the Mawdacch Trail, run 11k to the swim start in Barmouth alongside the banks of the estuary and across the Barmouth Bridge, then swim back under it with the other swimmers on the incoming tide. This is a long run before a long swim: you can run in your running clothes, change and have a drink before setting off with the other swimmers (there is likely to be a small time gap between the two events giving time for this to happen, and swimmers to depart together).