Where does “Присивашье” come from?

Присивашье (Russian) comes from Russian при-, from Russian при, from Proto-Slavic pri, from Proto-Balto-Slavic prei, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “Присивашье”, step by step

StepLanguageWordMeaning
1Russianпри-arrival; attachment, on; adding to
2Russianприin the presence of; in the time of; at, by
3Proto-Slavicprinext to, by, at; with; to
4Proto-Balto-Slavicpreiat, with
5Proto-Indo-Europeanper-before, in front; first; to go through
6Proto-Indo-Europeanpr̥tóspassed , crossed
Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Russian при- →