Short answers, pulled from the story.
Norrland covers about 60 percent of Sweden's total land area, making it the largest of the country's three traditional lands. Despite this size, it holds only around 12 percent of Sweden's population.
Kebnekaise, located in the Lappland province, is Sweden's highest mountain at 2,097 metres (6,879 feet). It stands in the far north of Norrland.
Several of Sweden's most celebrated ice hockey players were born in Norrland, including Peter Forsberg, Börje Salming, Markus Näslund, Henrik Lundqvist, Nicklas Bäckström, Elias Pettersson, and twins Henrik and Daniel Sedin.
The rivers of Norrland, fed by the Scandinavian Mountains, account for the bulk of Sweden's hydroelectric power. Hydroelectricity makes up approximately 40 percent of Sweden's total electricity production, and almost all major Norrland rivers have been exploited for water power.
Jämtland and Härjedalen belonged to Norway until 1645, when they became part of Sweden. Because of this later incorporation, they are sometimes considered outside the historical core of Norrland.
In the 2005 thriller, Larsson places a major portion of the plot in the fictional coastal town of Hedestad, described as just over an hour north of Gävle along the Norrland coast. The book repeatedly contrasts Stockholm's cosmopolitan character with Norrland's more conservative pace, and its global translation brought Norrland to the attention of readers outside Sweden.