Hláska – Krkavčí skály on Clmb House. Venue in Krkavčí skály, Prachovské skály, Český ráj, Czechia. Hláska is an individual climbing rock in Krkavčí skály, Prachovské skály, Český ráj, Czechia. The ČHS record includes traditional sandstone climbing. The ČHS...