Proto-Slavic *lěsъ

→ Belarusian лес (inherited)

→ Bulgarian лес (inherited)

→ Czech les (inherited)

→ Kashubian las (inherited)

→ Old Church Slavonic лѣсъ (inherited)

→ Lower Sorbian lěs (inherited)

→ Polish las (inherited)

→ Polabian ľos (inherited)

→ Russian лес (inherited)

→ Rusyn лїс (inherited)

→ Serbo-Croatian les (inherited)

→ Serbo-Croatian лес (inherited)

→ Serbo-Croatian lijes (inherited)

→ Serbo-Croatian лијес (inherited)

→ Slovak les (inherited)

→ Slovene les (inherited)

→ Ukrainian ліс (inherited)

→ Old Czech les (inherited)