Ukraine is a country in Eastern Europe. It is the second-largest country in Europe after Russia, which borders it to the east and northeast. Ukraine also borders Belarus to the north; Poland and Slovakia to the west; Hungary, Romania and Moldova to the southwest; and the Black Sea and the Sea of Azov to the south and southeast. Kyiv is Ukraine's capital and largest city, followed by Kharkiv, Odesa, and Dnipro. The official language of the country is Ukrainian. Ukraine covers an area of 603,628 km2 (233,062 sq mi) with an estimated total population of 32.3 million in 2026.