Östersund is an urban area (city) in Jämtland in northern Sweden. It is the seat of Östersund Municipality and the capital of Jämtland County. Östersund is located at the shores of Sweden's fifth-largest lake, Storsjön, opposite the island Frösön. It is the only city in Jämtland. The northern part of the urban area is located inside of the municipality of Krokom.