Tharlarion races, are a sport what is done at arenas or special race places at Gor. There are several diciplines of the races as well as several tharlarion kinds are used for the races. Goreans love to wagger and bet at this races.
Tharlarion races were regularly held at Venna, and other towns. Sometimes, interestingly, fortunes were wagered on kaissa matches.
Book 31, Conspirators of Gor: Chapter 9