Mikkeli is a city in, and the regional capital of, South Savo, Finland, located in the Finnish Lakeland. The population is approximately 52,000, whil…Mikkeli is a city in, and the regional capital of, South Savo, Finland, located in the Finnish Lakeland. The population is approximately 52,000, while the Mikkeli sub-region of Southern Savonia has a population of approximately 68,000. Mikkeli is the 18th most-populous municipality of Finland and the 19th most-populous urban area in the country.