Porvoo (ˈporʋoː; Borgå ˈborːɡo; Borgoa) is a city and a municipality in the Uusimaa region of Finland, situated on the southern coast about east of the city border of Helsinki and about from the city centre. Porvoo was one of the six medieval towns of Finland, along with Turku, Ulvila, Rauma, Naantali and Vyborg. It is first mentioned as a city in texts from the 14th century. Porvoo is the seat of the Swedish-speaking Diocese of Borgå of the Evangelical Lutheran Church of Finland. Porvoo was briefly the capital of the former Eastern Uusimaa region. Porvoo Old Town (Porvoon vanhakaupunki; Borgås gamla stan) is a popular tourist destination, known for its well-preserved 18th- and 19th-century buildings, and the 15th-century Porvoo Cathedral. The Old Town and the Porvoonjoki River Valley are recognized as, together, one of the National landscapes of Finland. The municipality's official languages are Finnish and Swedish. In 2021, 64.1% of the population spoke Finnish as their native language, while 28.3% were Swedish speakers, and 7.6% are speakers of other languages. The municipalities neighbouring Porvoo are Askola, Loviisa, Myrskylä, Pornainen, and Sipoo; and the sub-region maintained by Porvoo includes Askola, Myrskylä and Pukkila. The town received its name from a Swedish medieval fortress near the river Porvoonjoki, which flows through the town. The name Porvoo is the Fennicised version of the Swedish name Borgå, which is derived from borg, meaning "castle" and å, "river". The coat of arms of Porvoo, based on the medieval seal of the city, is "Azure [blue], a tulip-shaped letter C argent [silver]." The main object in the arms has been interpreted as either a fire iron or the letter C, referring to the Latin word for "castle" (castrum). A version of the arms redrawn by Gustaf von Numers was approved for official use by the Porvoo City Council on March 23, 1960, and the Ministry of the Interior confirmed the use of the coat of arms on June 1 the same year. The area of Porvoo has been inhabited since the Stone Age.