Wallachia is a historical and geographical region situated on the Northern side of the Danube River and the Southern side of the Carpathian Mountains. It can be traced back to the early 14th century when it was founded by Basarab I. In 1859 it united with Moldavia and it took the name of Romania in 1866. In 1918, it united with Bukovina, Transylvania and several other regions to form the Romania that we know and love today.
The best-known city in Wallachia is by far Bucharest, but the region is home to many others, such as Buzau, Craiova, or Ploiesti.