Sarpsborg is a city in Norway, located in the Østfold region. It was founded in 1016 by the Viking king Olav Haraldsson, making it one of the oldest cities in the country. The city is situated near the Glomma River, which is the longest river in Norway, and is known for its rich history and cultural heritage. Today, Sarpsborg is a vibrant community with a population of around 55,000 residents. The city features various parks, recreational areas, and historical sites, including the Borgarsyssel Museum. Sarpsborg also hosts several annual events and festivals, celebrating its local culture and traditions.