Sari (or Sary) is the largest township of the province and is located in the center of the province and has a moderate and humid climate. The city of Sary is the capital city of Mazandaran province, and is located 277 km. from Tehran. The city was primarily constructed in the pre-Islamic period and is related to Toos-Ebne-Nowdar. The large mosque of Sary was the first structure to be erected in the year 140 AH. by the Moslems. In the year 298 AH. the city was set to flames by tribes that thronged to it from the vicinity of the Caspian. In the beginning of the 4th century AH., floods caused severe damage to this area.
During the reign of Kharazmshah and the Mongol invasion, Sary was witness to further destruction. In the reign of Shah Abbas Safavid, important edifices were built in Sary. During the Zandiyeh conquests in Tabarestan, the capital was shifted to Barforoosh (Babol). In the years 1200-1211 AH. that is during the rule of Aqa Mohammad Khan Qajar, the capital city was once more transferred from Barforoosh to Sary, and once again promoted its importance. Today this beautiful city with the construction of private and government buildings, along with a railway line passing alongside the city, together with a good network of roads is a prospering vicinity.
The Clock Tower, in the Clock Square (Meydan-e-Sa'at) located in downtown Sari, attracts visitors and has become a famous landmark. Sari also contains the tombs of the Muslim cleric leaders Yahya and Zayn Al-Abedin, Emamzade-ye Abbas, and Shazdeh Hussein the architecture of which are from the 15th century.