Question: What republic in the South Caucasus region is Lankaran International Airport located?
Sentence (from "Azerbaijan"): Azerbaijan ( ; Azerbaijani: "Azərbaycan" , officially the Republic of Azerbaijan (Azerbaijani: "Azərbaycan Respublikası" )), is a country in the South Caucasus region, situated at the crossroads of Southwest Asia and Southeastern Europe.
Relevant evidence: Yes