Běh na Koráb is a 6.54 km race in Kdyně, a town in the Domažlice district of the Plzeňský kraj region. The listing puts it on a Sunday, and the event also goes by the short name Pětka.
With 112 participants listed, it reads like a local Czech running event rather than a big-city race. The available course information is limited to the distance and Koráb name, and runners are pointed to bezecchodska.cz for event details.