Běh na Lahti is a forest running race held on Stoliční hora Kvádrberk in Děčín, situated above the Elbe River canyon, which is the largest sandstone canyon in Europe. ASK Děčín organizes the event, offering participants two route choices: a main race covering 9.8 km and a shorter option of just under 5 km.
The main course begins at the Kvádrberk viewpoint, ascends 230 meters, and proceeds above the village of Ludvíkovice before returning at the 5 km mark. The shorter route is considerably less demanding, allowing runners to enjoy the scenery without the full ascent. The race website offers precise maps and GPX files for both courses. This is a long-established local race, with over forty editions completed.