Savonlinna has a population of 33,580, as of 2019.
Savonlinna is in the province of Eastern Finland in the region of Etelä Savo (South Savo).
Over one-third of the Savonlinna area is water or islands.
The city was founded in 1639, based on Olavinlinna castle.
The castle was founded by Erik Axelsson Tott in 1475 in an effort to protect Savonia and to control the unstable border between the Kingdom of Sweden and its Russian adversary.
In 1973 the municipality of Sääminki was consolidated with Savonlinna. At the beginning of the year 2009, the municipality of Savonranta and a 31.24 km2 land strip from Enonkoski between Savonlinna and Savonranta were consolidated with Savonlinna.
Savonlinna is twinned with: Torzhok, Russia; Kalmar, Sweden & Detmold, Germany.
There is non-governmental cooperation with the following cities: Silkeborg, Denmark; Arendal, Norway & Árborg, Iceland.
Savonlinna is a home for Saimaa ringed seal, one of the rarest seal breeds in the world.
Approximately 800 000 tourists visit Savonlinna per year.