If you are a marathon swimmer, I would highly recommend the North Channel, a 21 mile swim across the Irish Sea from Ireland to Scotland. It is well known as one of toughest marathon swims in the world due to its very cold water temperatures, strong tidal flow, and proliferation of jellyfish. Many swimmers consider the North Channel as the most difficult swim of the Ocean's Seven Challenge. This 3 minute video shows the viewer a glimpse of Donaghadee Harbor in Ireland. My boat pilot Quinton Nelson moors his boat there. I would highly recommend staying at Pier 36 and having Quinton as your boat pilot.