Čedičové varhany u Hlinek, Natural monument near Nové Kounice, Czech Republic

Čedičové varhany is a natural monument southwest of Hlinek in the Karlovy Vary District, below the Hůrka peak at 817 metres. It protects the wall of an abandoned quarry where basalt columns, a classic example of columnar jointing, taper slightly toward the top like a woodpile. The columns are made of nephelinite that grades into tephrite where feldspar is richer.

The site is the remnant of a Tertiary volcano roughly 22 million years old. As the lava cooled and contracted, it solidified into hexagonal columns, called "organs", that taper slightly toward the top. The abandoned quarry wall is now a protected natural monument managed by the Slavkovský les protected landscape area administration.

The name refers to the columns' resemblance to organ pipes, and the Czech word varhany means organ. The former quarry is a visitor site of Geopark Egeria, part of the Czech-Bavarian Geopark, and a national geopark QR code at the entrance links to specialist information.

The site is accessible via a marked hiking path located about 1 kilometer (3,280 feet) southeast of the nearby settlement. An information board at the location provides geological details to help visitors understand the natural formations they see.

The former quarry wall is part of the Egeria Geopark, within the Czech-Bavarian Geopark; a QR code on the information board links to specialist geological information. In 2015 brush was cleared from the wall and the tops of the columns cleaned, and in 2019 large fallen basalt columns were lifted and placed by the board as geological samples.