Tula Oblast (Russian: Ту́льская о́бласть, Tulskaya oblast) is a federal subject (an oblast) of Russia. It is geographically in the European Russia region of the country and is part of the Central Federal District, covering an area of 25,700 square kilometers (9,900 sq mi) and a population of 1,553,925 (2010). Tula is the largest city and the capital of Tula Oblast.