Ironman Texas is an Ironman-distance triathlon in The Woodlands, TX. A 2.4 mile swim followed by a 112 mile bike followed by a 26.2 mile run (a marathon). You have 17 hours to do all of that and get yourself across the finish line.
Ironman Texas would be my 7th Ironman. If you're the sort of masochist who enjoys ridiculously long race reports, you can read the other six Ironman race reports, as well as my Ultraman Canada race report here. Fair warning: I'm not kidding when I say they're long.
Spoiler: I finished.