San Marino, officially known as the Republic of San Marino (RSM), is a landlocked microstate located in Southern Europe. It is completely surrounded by Italy and situated on the northeastern slopes of the Apennine Mountains. As of 2025, it has a population of 34,042 and covers a land area of just over 61 square kilometres.
The country is the fifth-smallest in the world and is one of two microstates within the Italian Peninsula, the other being Vatican City. The capital city, the City of San Marino, is positioned atop Monte Titano, while Dogana serves as the nation's largest settlement within the municipality of Serravalle.