This article provides a comparative analysis of the microtoponymy of the Belarusian Poozerie and Western Polesie, identifying both common features and regionally specific characteristics of the nomination principles for these regions. Lexical and semantic groups of microtoponyms in the Belarusian Poozerie and Western Polesie are examined: microtoponyms reflecting the physical and geographical features of the terrain, flora and fauna; microtoponyms reflecting human economic activity, lifestyle, religious beliefs and social relations; microtoponyms based on proper names. Based on the quantitative percentage ratio, productive and unproductive types and subtypes of microtoponyms of each region are determined.

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