Luhansk Oblast is located in eastern Ukraine. The area of the oblast (26,700 km²), comprises about 4.42% of the total area of the country.
Its longitude from north to south is 250 km, from east to west – 190 km. The oblast has the longest segment of the Ukrainian international border with Russia among other regions (see State Border of Ukraine) consisting of 746 km (464 mi). It borders the Belgorod and Voronezh Oblasts of Russia on the north, while the Rostov Oblast is located to the east and the south. Among Ukrainian regions, the oblast borders the Kharkiv and Donetsk Oblasts to its west.
The region is located in the valley of Siversky Donets which splits the region approximately in half. The southern portion of the region is elevated by the Donetsk Ridge which is located closer to the southern border. The highest point is
Mohyla Mechetna (367 m (1,204 ft)) which is the highest point of Donetsk Ridge.
The left bank of Siversky Donets is part of the Starobilsk Plain which to the north transforms into the Central Russian Upland.