Really! Steve King surfed 7.6 miles in 1 hour and 17 minutes on one wave!
In a wonderful book entitled The Unlikely Voyage of Jack de Crow, the author mentions that on certain dates the changing tide rolls up the river Severn in England as a single wave called a "bore"...a phenomenon he was more than a little concerned about, given that he was sailing a tiny 11 foot dingy. He writes, in passing, that folks have been known to surf the bore wave for miles.
Sure 'nuff, the wave can provide quite a ride. When tidal waters are forced up the Severn Estuary, which becomes narrower as it progresses, the wave can reach 6 feet in height and travel as fast at 20 miles per hour.
The next big daytime tidal bore wave on the Severn will occur on March 20 and 21 2007 around 8:30am.