
Bořeň (539 m) is a phonolite hill two kilometres south of Bílina in the Czech Republic. It is a structure similar to the Devils Tower in Wyoming, and is the largest phonolite rock of its kind in Europe.
Bořeň (539 m) is a phonolite hill two kilometres south of Bílina in the Czech Republic. It is a structure similar to the Devils Tower in Wyoming, and is the largest phonolite rock of its kind in Europe.