 In 1643, Russian adventurers spilled over the Stanovoy Range, but by 1689 they were driven back by the Qing.The land was populated by some 9,000 Daurs on the Zeya River, 14,000 Duchers downstream and several thousand Tungus and Nivkhs toward the river mouth.The first Russians to hear of Dauria were probably Ivan Moskvitin and Maxim Perfilev about 1640.