Swedish

Salomon August Andree (1854-1897)

First to explore the Arctic by balloon (1896-1897)
Sven Anders Hedin (1865-1952)

Explored routes across the Himalayas and produced the first maps of Tibet (1891-1908)
Traveled with a Sino-Swedish expedition across the Gobi Desert (1928-1933)
Nils Adolf Erik Nordenskjöld (1832-1901)

First to sail along the Northeast Passage from Sweden via the Barents, Kara, and Laptev Seas to the Bering Sea (1878-1879)