The article addresses some etymological issues of the place names of Setumaa, which have hitherto received insufficient attention, if any. Those issues include Baltic substrate names. Attention is drawn to those names of Russian origin that reflect sound changes enabling relative dating. The article emphasizes the necessity of a systematic in-depth investigation of the stratigraphy of the whole toponymic material recorded from Setumaa, with a view to obtaining new reliable information on the settlement history of the region.
