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In page Ulan-Ude:

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The first occupants of the area where Ulan-Ude now stands were the Evenks and, later, the Buryat Mongols. Ulan-Ude was settled in 1666 by the Russian Cossacks as the fortress of Udinskoye. Due to its favorable geographical position, it grew rapidly and became a large trade center which connected Russia with China and Mongolia and, from 1690, was the administrative center of the Transbaikal region.[citation needed]