Nad Tatrou sa blýska (Slovak pronunciation: [ˈnat tatrow sa ˈbliːska]; English: Lightning over the Tatras) is the national anthem of Slovakia. The origins of the anthem are in the Central European activism of the 19th century. Its main themes are a storm over the Tatra mountains that symbolized danger to the Slovaks, and a desire for a resolution of the threat. It used to be particularly popular during the 1848–1849 insurgencies.