The story
- Russian · calque ofЗакаспи́йская о́бласть“Transcaspian oblast”
- English todayTranscaspia
From Russian Закаспи́йская о́бласть (Zakaspíjskaja óblastʹ, “Transcaspian oblast”) as trans- + Caspia, from the fact that in the early 20th century the easiest way to reach it from central Russia or Transcaucasia was across the Caspian Sea, by boat.
Etymology from Wiktionary, CC BY-SA 4.0.