SM — San Marino

San Marino is one of the world's smallest and oldest republics, an enclave entirely surrounded by Italy. The capital, also called San Marino, sits atop Mount Titano. San Marino claims to be the world's oldest surviving sovereign state, founded in 301 AD. It uses the Euro through a monetary agreement with the EU, and issues its own Euro coins which are collectible. For developers, the SM country code maps to the it-SM locale for Italian as used in San Marino. The .sm domain and +378 calling code serve this microstate. San Marino's enclave status (entirely within Italy) creates interesting geographic edge cases similar to Vatican City and Lesotho. Despite its tiny size, San Marino has its own postal system, vehicle registration, and internet domain. The country's Euro coins, while valid throughout the Eurozone, are produced in limited quantities and command numismatic premiums. San Marino's participation in the Euro system without EU membership is similar to Monaco, Vatican City, and Andorra.