Wikipedia
Hertsön is a Swedish island in the Bothnian Bay, largely occupied by the eastern districts of the city of Luleå.
Due to post-glacial rebound, the islands Svartön, Mulön, Granön and Björkön have merged with the island. The size of the island is around 73 km², making it the twelfth largest island in Sweden.
Hertsön is a residential area in Luleå, Sweden. It had 5,436 inhabitants in 2010, making it one of the largest districts in Luleå.
The district was built in the 1970s as part of the Million Programme, due to the planned construction of a new steel mill ( Stålverk 80), which was expected to give the city a large increase in population. As the plans of the new steel mill were binned, following the victory of the right-wing coalition in the general election of 1976, there have periodically been many empty apartments in the area.