Dutch navigator and colonial governor, Willem Janszoon sailed from the Netherlands for the East Indies for the third time on December 18, 1603, as captain of the Duyfken (or Duijfken, meaning "Little Dove"), one of twelve ships of the great fleet of Steven van der Hagen. Once in the Indies, Janszoon was sent to search for other outlets of trade, particularly in "the great land of Nova Guinea and other East and Southlands." On November 18, 1605, the Duyfken sailed from Bantam to the coast of western New Guinea. Janszoon then crossed the eastern end of the Arafura Sea, without seeing the Torres Strait, into the Gulf of Carpentaria. On February 26, 1606, he made landfall at the Pennefather River on the western shore of Cape York in Queensland, near the modern town of Weipa. This is the first recorded European landfall on the Australian continent. Janszoon proceeded to chart some 320 kilometres (199 miles) of the coastline, which he thought was a southerly extension of New Guinea. In 1615, Jacob le Maire and Willem Schouten's rounding of Cape Horn proved that Tierra del Fuego was a relatively small island. In 1642–1644 Abel Tasman, also a Dutch explorer and merchant in the service of the VOC, circumnavigated New Holland proving that Australia was not part of the mythical southern continent. He was the first known European expedition to reach the islands of Van Diemen's Land (now Tasmania) and New Zealand and to sight the Fiji islands, which he did in 1643. Tasman, his navigator Visscher, and his merchant Gilsemans also mapped substantial portions of Australia, New Zealand and the Pacific Islands. Russian exploration of Siberia (1581–1660) Main articles: Russian conquest of Siberia, Conquest of the Khanate of Sibir, Siberian River Routes, and List of Russian explorers Siberian river routes were of primary significance in the process of exploration. In the mid-16th century the Tsardom of Russia conquered the Tatar khanates of Kazan and Astrakhan, thus annexing the entire Volga Region and opening the way to the Ural Mountains. The colonization of the new easternmost lands of Russia and further onslaught eastward was led by the rich merchants Stroganovs. Tsar Ivan IV granted vast estates near the Urals as well as tax privileges to Anikey Stroganov, who organized large scale migration to these lands. Stroganovs developed farming, hunting, saltworks, fishing, and ore mining on the Urals and established trade with Siberian tribes.