SK — Slovakia

Slovakia is a Central European country known for its mountainous terrain, medieval castles, and historic towns. Bratislava, the capital, is the only national capital that borders two other countries (Austria and Hungary). Slovakia adopted the Euro in 2009, replacing the Slovak Koruna (SKK). For developers, the SK country code maps to the sk-SK locale for Slovak. The .sk domain and +421 calling code serve Slovakia. Slovak and Czech are mutually intelligible but distinct languages with different locales. Slovakia's Euro adoption in 2009 means historical data uses SKK while current data uses EUR. Slovak uses extensive diacritical marks (á, ä, č, ď, é, í, ĺ, ľ, ň, ó, ô, ŕ, š, ť, ú, ý, ž) — more than most European languages. The letters ĺ and ŕ (long l and long r acting as vowels) are nearly unique to Slovak. Bratislava's proximity to Vienna (only 60 km apart) makes it part of a cross-border tech and business corridor. Slovak personal identification numbers (rodné číslo) have specific format and validation rules.