Wikipedia
Selaön
Selaön is the largest island in Mälaren, Sweden, and covers 95 km². It is located at Stallarholmen, east of Strängnäs, and it has about 3,000 permanent residents. It is connected by a bridge to the mainland. It is the largest island in any lake in Sweden. In the Heimskringla, Granmar, the king of Södermanland, was murdered on this island by Ingjald Illruler.