Bulgaria is located in Southeastern Europe, with a population of over 7.6 million people who primarily speak Bulgarian. Some key facts about Bulgaria are: - The capital and largest city is Sofia, with other major cities including Burgas, Varna, Ruse, and Stara Zagora. - Bulgaria borders Romania, Serbia, Macedonia, and Greece and has mountain ranges including the Balkan Mountains, Rila Mountains, and Rhodope Mountains. Rivers include the Danube and Struma. - Notable inventions from Bulgaria include the first electronic computer, digital watch, and car air bag. Famous athletes include soccer players Hristo Stoichkov and Dimitar Berbatov,