As proved by the charts Olaus Magnus had used, Greenland and Northern Scandinavia are now separated. The immense amount of information on the map would fill a book. Olaus wanted to show the Catholic Church how important an area it had lost in the Reformation. Olaus Magnus found his data in various sources. He gained first hand information when he travelled selling indulgences along the coast of the Gulf of Bothnia in 1518-1519.
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The dimensions of the Gulf of Bothnia are fairly correct, but the Gulf of Finland runs erroneously from southwest to northeast. The mistake might be due to the fact that when Olaus Magnus travelled along the Ostrobothnian coast, he heard about water routes to Lake P ij nne from several different rivers. Lacvs Albvs, Lacvs Piente, Holela Lacvs and other information on the Finnish inland had long lasting effect on maps of Finland.