Where does “유즈노사할린스크” come from?

유즈노사할린스크 (Korean) comes from Russian Южно-Сахали́нск, from Russian ю́жный, from Russian -ный, from Old Church Slavonic -ьнъ, from Proto-Slavic -ьnъ — -ish, -ic, -al, -ed; From adjectives.

Ancestry of “유즈노사할린스크”, step by step

StepLanguageWordMeaning
1RussianЮжно-Сахали́нск
2Russianю́жныйsouth, southern
3Russian-ный-ish, -ic, -al, -ed
4Old Church Slavonic-ьнъish, -ic, -al, -ed
5Proto-Slavic-ьnъ-ish, -ic, -al, -ed; From adjectives
Every word from Proto-Slavic -ьnъEvery word from Russian -ныйEvery word from Old Church Slavonic -ьнъ