Which are the four Eastern European countries? Detailed introduction of the four Eastern European countries.

1. The four Eastern European countries are: Czech Republic, Hungary, Bulgaria, Austria/Germany.

2. The capital of the Czech Republic is Prague, which is a country with strong local cultural characteristics. The capital, Prague, is the largest city in the Czech Republic, located near the Vltava River, and is also the central city on the European continent. Prague is a famous tourist city characterized by its various styles of architecture.

3. The capital of Hungary is Budapest, and the official language of the country is Hungarian. Hungary is located on the impact plain of the Danube River, so the overall terrain is not high, and the west is the famous Alps.

4. Bulgaria is located slightly in the south, close to the Black Sea. The country's main religion is Orthodox Christianity, and Bulgarians use Bulgarian as their official language. Its capital, Sofia, is located in the central and western part of Bulgaria, with a population of 1.325 million people and an area of ??167 square kilometers.

5. Since the four Eastern European countries have different interpretations in terms of economy, politics, culture, geography, etc., both Austria and Germany were once called one of the four Eastern European countries. Vienna, the capital of Austria, is a world-famous music capital, where many world-class musicians were born; Berlin, the capital of Germany, is also one of the famous cities in the world.