Jizerska 50 in Bedřichov/Jizera Mountains
Jizerska 50 began in January 1968 with fifty-two competitors racing between Bedrichov and Korenov, organised as fitness training for mountaineers, and has run as the Peru Expedition Memorial since 1972, commemorating fifteen Czechoslovak climbers killed in a 1970 Huascaran avalanche, several of whom had raced Jizerska months earlier. Now part of the international Worldloppet series since 2000, it is billed as the Czech Republic's greatest cross-country ski race.
Jizerska 50 began in January 1968, when fifty-two competitors from the ski club of Liberec took part in a race through the Jizera Mountains between Bedrichov and Korenov and back, organised as a fitness test for mountaineers from the TJ Lokomotiva Liberec club preparing for serious high-altitude expeditions.