San Marino is divided into the following nine municipalities, known locally as castelli (meaning "castles").
The territory of San Marino (61 sq. km/24 sq. m) is mostly hilly country with Mount Titano in the center. It was founded, according to tradition in 301 A.D. Legend has it that a master stone-cutter, Marinus, left is native island and came to Mount Titano to establish a small community of Christians anxious to escape the persecutions of the emperor Diocletian.
The Rivers of San Marino play an important role in shaping the geography of the country of San Marino. The two main rivers that flow through San Marino are San Marino River and Ausa River.