Bratislava is the capital of the Slovak Republic, its largest city in terms of area and population, and the centre of Bratislava Region. According to the Statistical Office of the Slovak Republic, approximately 430 000 people live in the city. Bratislava is located at the foot of the Little Carpathians, between the Záhorská and Danubian Lowlands. The Danube flows through the city. Bratislava is situated on the borders with Austria and Hungary, making it the only capital city in the world lying at the border of three states. The city is dominated by Bratislava Castle, with its landmark four turrets, and St Martin’s Cathedral. In terms of gross domestic product (GDP), Bratislava, at 179% of the per capita average, is among the most productive regions in Europe.