Where does “левобережный” come from?

левобережный (Russian) comes from Russian берёг, from Old East Slavic берегъ, from Proto-Slavic bergъ, from Proto-Balto-Slavic *bérgas, from Proto-Indo-European *bʰérǵʰos, from Proto-Indo-European bʰerǵʰ- — to rise; high, lofty; hill, mountain.

левобережный (Russian): left bank

Definitions

  1. left bank

Ancestry of “левобережный”, step by step

левобережный traces back through two separate lines of ancestry.

via Russian берёг

StepLanguageWordMeaning
1Russianберёгmasculine singular past indicative imperfective...
2Old East Slavicберегъbank; shore
3Proto-Slavicbergъhill; slope, cliff?; bank, shore?, coast?
4Proto-Balto-Slavic*bérgashill
5Proto-Indo-European*bʰérǵʰoshill
6Proto-Indo-Europeanbʰerǵʰ-to rise; high, lofty; hill, mountain

via Russian ле́вый

StepLanguageWordMeaning
1Russianле́выйleft, left-hand
2Old East Slavicлѣвъleft, wrong, evil
3Proto-Slaviclě̑vъleft
Every word from Proto-Indo-European bʰerǵʰ-Every word from Proto-Indo-European *bʰérǵʰosEvery word from Proto-Balto-Slavic *bérgas