Běžecká série Berounka is a 12-race trail and cross-country series along the Berounka river, running from Radotín toward Nižbor in Central Bohemia. The races are traditionally held on the first Monday of the month, with starts at 18:00, and the series continues through the end of the year. The Nižbor round is a 9.5 km race based at Restaurace Zastávka Nižbor in the Beroun District.
The series moves through places tied closely to the river, including Karlštejn, Srbsko, Tetín, Beroun, and Nižbor. One round in Řevnice is 9.9 km with 250 meters of climbing and mostly follows the Fabián educational trail. Jan Mrňák organizes the series, registration is available online, and runners can also sign up on site from 17:00.