Czech Republic

The southeastern part of the Bohemian Massif is occupied by the Bohemian-Moravian Highlands, which is the geologically oldest area in Central Europe.

An excerpt from the article 27 facts about Czech Republic

When the Czech mountains were rising, there was volcanic activity, the remains of which today are numerous chimneys and volcanic flows, ashes, and springs of mineral and hot waters. There are thermal springs in Karlovy Vary and Mariánské Lázně.