The swim is in a rather large lake in town. It's the lake that provides the drinking water for most of the Oklahoma City area, so swimming is prohibited except on race day (and for 2 hours the 2 days before the race for practice swims). It's kind of fun to swim in a lake that I'd be ticketed or arrested for swimming in any other day of the year. I just hope that after the race they run some extra chlorine though the treated water they draw out, cuz you KNOW what triathletes do in water...