The Tsardom of Russia in mid-16th century was under the leadership of Ivan IV commonly known as Ivan the Terrible, he began the expansion into northwest Asia, and the region is commonly called Siberia.
Around the late 18th and 19th century, the Russian explorers mapped most of Alaskan coasts and nearby islands; they explored the inner areas of the Peninsula, and went as far as Fort Ross in California. The explorers penetrated the depth of Eurasia granting Russia the conquest of Central Asia.
Siberia, Alaska, Central Asia and the Extreme North were explored greatly by Russian Explorers. They made significant contribution to the exploration of the Artic and Antarctic, the Pacific islands as well as the deep sea.