(Norrland isn't a province. It's one of three regions of Sweden, roughly the two northern thirds of the country by area, containing nine of the twenty-five traditional provinces.)
One area around three national parts (Padjelanta, Sarek, Stora sjöfallet) is also called Laponia.
But the political division of Sweden around that area - that's Norbottens län, so that's the subdivision that people care most about in their day-to-day life.