Čerťák, Ski jumping stadium in Harrachov, Czech Republic

Čerťák is a ski jumping complex on the north slope of Čertova hora at 862 m, with five jumps: a K185/HS 210 flying hill, a K120 large hill, and K90, K70 and K40 hills. The two largest stand side by side in the northwest part of the slope; the three smaller ones lie in the northeast. The flying hill's in-run is 118.5 m long at 35°, and its takeoff sits 4.62 m high.

The first jump here, the Teufelsschanze, was built in 1920 by the German Wintersportverein on the initiative of hotelier Erlebach; jumps of around 30 m were made, later over 60 m. The large-jump complex was built in 1977–1980 after blasting rock and moving over 180,000 cubic metres of earth. The mammoth hill opened in 1979 as K165, was altered to K185 in 1982 and renovated to HS205 in 1992.

Locals call the K185 flying hill simply Čerťák, after Čertova hora, the "Devil's Mountain" on whose northern slope it stands. The complex hosted the Ski Flying World Championships in 1983, 1992, 2002 and 2014, and in 1996 it became the first hill in the world where the 200-metre mark was passed in an official competition.

The two largest jumps stand together on the north-western slope of Čertova hora, while the K40, K70 and K90 jumps lie in the north-eastern part of the hill. The site sits at 862 m above sea level, where strong crosswinds are common; cloth screens were hung along the in-run to reduce their effect. The mammoth hill has been closed since 2014.

In 1996, Čerťák became the first hill in the world where a jump over 200 metres was recorded in an official competition. The in-run is 122.5 m long and jumpers reach roughly 101 km/h before take-off.