Proto-Slavic *prostorъ

→ Belarusian прастора (mention)

→ Bulgarian простор (inherited)

→ Czech prostor (inherited)

→ Macedonian простор (inherited)

→ Polish przestwór (derived)

→ Russian простор (inherited)

→ Serbo-Croatian prostor (inherited)

→ Serbo-Croatian простор (inherited)

→ Slovene prostor (inherited)

→ Ukrainian простір (inherited)