Chernia kos is a ski jumping

Ski jumping

Ski jumping is a sport in which skiers go down a take-off ramp, jump and attempt to land as far as possible down the hill below. In addition to the length of the jump, judges give points for style. The skis used for ski jumping are wide and long...

 venue in Samokov

Samokov

Samokov is a town in Sofia Province in the southwest of Bulgaria. It is situated in a kettle between the mountains Rila and Vitosha, 55 kilometres from the capital Sofia...

, Bulgaria

Bulgaria

Bulgaria , officially the Republic of Bulgaria , is a parliamentary democracy within a unitary constitutional republic in Southeast Europe. The country borders Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, as well as the Black Sea to the east...

. The venue includes three hills, K40, K25 and the small K10. The hills are covered with plastic matting during the summer. Every summer youth competitions are hosted, in order to train Bulgarian ski jumpers.

The hills have inrun trails made of stainless steel

Stainless steel

In metallurgy, stainless steel, also known as inox steel or inox from French "inoxydable", is defined as a steel alloy with a minimum of 10.5 or 11% chromium content by mass....

 but the plastic mattings are in bad quality and already over 20 years old.

The active professional ski jumpers Vladimir Zografski

Vladimir Zografski

Vladimir Zografski, born 14 July 1993 in Samokov, Bulgaria is an Bulgarian ski jumper. He took a 43rd place in the K-90 Normal hill competition in the FIS Nordic World Ski Championships 2009 in Liberec, Czech Republic...

 and Deyan Funtarov are both from Samokov and started training in these hills.