Dolj originally meant "lower Jiu", as opposed to Gorj(upper Jiu) is a county of Romania on the border with Bulgaria, in Oltenia, with the capital city at Craiova.
In 2011, it had a population of 660,544 and a population density of 89/km2 (230/sq mi).
This county has a total area of 7,414 km2 (2,863 sq mi).
The entire area is a plain with the Danube on the south forming a wide valley crossed by the Jiu River in the middle. Other small rivers flow through the county, each one forming a small valley. There are some lakes across the county and many ponds and channels in the Danube valley. 6% of the county's area is a desert.
- Olt County to the east.
- Mehedinți County to the west.
- Gorj County and Vâlcea County to the north.
- Bulgaria – Vidin Province to the southwest, Montana and Vratsa provinces to the south.