Why it's the capital
Buda became the capital of Hungary in 1361. The separate cities of Buda, Óbuda and Pest were officially joined into one city, Budapest, in 1873.
Capital of HungaryBudapest stands on the Danube at the centre of the Pannonian Basin. Hilly Buda lies on the western bank, and Pest spreads across a flat plain on the eastern bank.
Buda became the capital of Hungary in 1361. The separate cities of Buda, Óbuda and Pest were officially joined into one city, Budapest, in 1873.
Follow the Danube downstream from Vienna and Bratislava: the next capital on the river is Budapest, about 216 km south-east of Vienna by car.
Budapest is often confused with Bucharest, the capital of Romania. Budapest is the capital of Hungary, split in two by the Danube.
Sources: Wikipedia: Budapest, Wikipedia: Danube