Martin Shpanberg
Martin Petrovich Shpanberg (died 1761) was a Danish born naval lieutenant who took part in Berings two Kamchatka expeditions as second in command. He is best known for exploring the Kuril Islands
Kuril Islands
The Kuril Islands , in Russia's Sakhalin Oblast region, form a volcanic archipelago that stretches approximately northeast from Hokkaidō, Japan, to Kamchatka, Russia, separating the Sea of Okhotsk from the North Pacific Ocean. There are 56 islands and many more minor rocks. It consists of Greater...

and finding the sea route to Japan.
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