and from Svalbard. In 1898 he embarked on another expedition with Fram. Sverdrup attempted to circumnavigate Greenland via Baffin Bay but failed to make it through the Nares Strait. Forced to overwinter on Ellesmere Island, he and his crew explored and named many uncharted fjords and peninsulas on the western shores of the island, explaining the Norwegian names, such as Hoved Island ("main island") and Prince Gustav Adolf Sea (after the Swedish king Gustav VI Adolf) in the Canadian Arctic. Between 1899 and 1902, he overwintered three more times on Ellesmere Island in the Canadian Arctic with the Fram, continuing to explore and map, culminating in the discovery of the islands to the west of Ellesmere Island, namely Axel Heiberg, Amund Ringnes and Ellef Ringnes, collectively known as the Sverdrup Islands. In adopting Inuit methods, Sverdrup and his crew were able to chart a total of 260,000 square kilometers - more than any other polar exploration. The area was famously mapped by his topographer, Gunnar Isachsen, and 35 academic publications were penned as a result of the expedition. Upon Sverdrup's return in Norway, he was treated as a national hero. However, he remains relatively unknown in North America, and relatively unknown for his Canadian exploration in Norway. Sverdrup officially claimed all three islands he discovered for Norway in 1902, setting off a sovereignty dispute with Canada, which claimed sovereignty over all land, discovered or undiscovered in what is now the Canadian Arctic. The dispute was not settled until 1930 when Norway ceded the islands to Canada. In that year Sverdrup signed a deal with the Canadian Government, who would buy the records of Sverdrup's expeditions for $67,000 Canadian dollars. Sverdrup died just two weeks after the deal was signed, but the money secured the future of his family. The records were archived in the National Archives of Canada, but were later returned to the National Library of Norway. One of Sverdrup's lesser known exploits was a search-and-rescue expedition aboard ship Eklips in the Kara Sea in 1914–1915. His aim was to search for two missing Arctic expeditions, that of Captain Georgy Brusilov on the St. Anna and that of Vladimir Rusanov on the Gerkules. Sverdrup's fourth and last expedition in Arctic Siberian waters was in 1921, when, from the bridge of the Soviet Icebreaker Lenin, he commanded a convoy of five cargo ships on an experimental run through the Kara