Ravkan is the language commonly used by the inhabitants of Ravka.
Keramzin - A Ravkan city (CARE-ahm-tsin)
Ryevost - A Ravkan city near the river (RYEH-vohst)
Tsibeya - the wilderness near Ravka's border (tsi-BEH-yah)
Os Alta - the capital of Ravka (ohs-ALL-tah)
Istorri Sankt'ya - the Book of Saints (EES-tor-ee sankt-YAH)
Otkazat'sya - The Abandoned (oht-kah-ZAHTS-yah)
Moi Tsar/ Moya Tsaritsa - The title when addressing the king/queen (moy TSAHR, MOY-ah tsah-REE-tsah)
Moi Soverennyi - The title when addressing The Darkling (moy soh-veh-REN-yee)
Korol Rezni - King of Scars; Nikolai Lantsov's nickname after being transformed into something dark
Sol Koroleva - Alina's nickname
- As revealed by Leigh Bardugo, Ravkan isn't Russian, but a completely new language - based on Russian and Mongolian.