Hisingen is the fifth-largest island of Sweden (after Gotland, Öland, Södertörn and Orust), with an area of 199 km2 (77 sq mi). It forms part of Gothenburg and is bordered by the Göta älv to the south and east, the Nordre älv to the north, and the Kattegat to the west. The northern part of the city of Gothenburg, with its harbours, industries and suburbs, is located on the island, which is divided between the two historical provinces of Västergötland and Bohuslän. The population of the island is around 130,000, making it the most populated island in Sweden, ahead of Södermalm and Gotland. For a brief, post-war period Hisingen was home to the largest shipbuilding centre in the world, but all three yards closed in 1979. Hisingen is home to both the Volvo Group and the now separate Volvo Cars. Most of the Nordic countries' largest port, the Port of Gothenburg is also located on Hisingen.