Question: What is the largest city on the Caspian Sea and of the Caucasus region, has a railway line in the station in a settlement in the municipality of Nakhchivan in Nakhchivan City, Nakhchivan Autonomous Republic, Azerbaijan?
Sentence (from "Baku"): Officially, about 25 percent of all inhabitants of the country live in Baku's metropolitan area.
Relevant evidence: No