Q. Which three countries constitute the geographical region "Thrace"?
Answer: Greece, Bulgaria and Turkey
Notes: Thrace is a geographical region located in the southeast of Europe. It is bounded by the Balkan Mountains to the north, the Black Sea to the east, the Aegean Sea to the south, and the Sea of Marmara and the Dardanelles to the west. The region is divided among three countries: Bulgaria, Greece, and Turkey. The largest city in the region is Istanbul, which straddles the Bosporus Strait and is located in both Europe and Asia. The region has a rich history and has been inhabited since ancient times by various cultures, including the Thracians, Greeks, Persians, Romans, and Ottomans.