Transylvania (Romanian: Ardeal or Transilvania) is a historical region in the central part of Romania.

The historical region granted to Romania in 1920 covered 23 counties including nearly 102,200 km² (102,787 - 103,093 in Hungarian sources and 102,200 in contemporary Romanian documents) now due to the several administrative reorganisations Transylvania covers 16 present-day counties (Romanian: judeţ) which include nearly 99,837 km² of central and northwest Romania.

The 16 counties are: