spa town, western Czech Republic. It lies at the foot of Mount Klínovec, the highest summit in the Ore Mountains (Krušné hory), just north of Karlovy Vary and near the border with Germany. A silver-mining centre for the Holy Roman Empire, the town reached its peak in the 16th century, when its mines were owned by the counts of Šlik (German: Schlik). The German monetary unit taler, or thaler, from which the English word dollar is derived, refers to the Joachimsthaler, a coin first minted in Jáchymov in 1517.

The town lost heavily in wealth and population during the Thirty Years' War (1618–48), and in the mid-19th century it was ravaged by fire. The local mining of uranium began in 1908 and reached its peak immediately after World War II, but it has since ceased. Treatments at the town's spa are based on the use of radioactive thermal baths. In the 1930s the town's Radium Palace Hotel was widely known as a deluxe hotel. Pop. (2004 est.) 3,143.