Where does “Polesí” come from?

Polesí (Czech) comes from Czech les, from Old Czech les, from Proto-Slavic lěsъ — forest, woods.

Ancestry of “Polesí”, step by step

StepLanguageWordMeaning
1Czechlesforest
2Old Czechlesforest
3Proto-Slaviclěsъforest, woods
Every word from Proto-Slavic lěsъ →Every word from Old Czech les →Every word from Czech les →
Polesí — Etymology, Origin & Word History | Etymology Explorer