Frankfurt am Main (help·info) (German: [ˈfʁaŋkfʊɐtʰ], English: [ˈfɹæŋkfɜːt]) is the largest city in the German state of Hesse and the fifth-largest city in Germany, with a 2008 population of 670,000. The urban area had an estimated population of 2.26 million in 2001.[1] The city is at the centre of the larger Frankfurt Rhine Main Region which has a population of 5.3 million and is Germany's second largest metropolitan area. Situated on the River Main, Frankfurt is the financial and transportation centre of Germany and one of the two largest financial centres in continental Europe, the other being Paris. It is the place of residence of the European Central Bank, the German Federal Bank, the Frankfurt Stock Exchange and the Frankfurt Trade Fair, as well as several large commercial banks. Frankfurt International Airport is one of the world's busiest airports, Frankfurt Central Station is one of the largest terminal stations in Europe. Frankfurt is the only German city listed as one of ten Alpha world cities. Among English speakers the city is commonly known simply as "Frankfurt", though Germans occasionally call it by its full name when it is necessary to distinguish it from the other (significantly smaller) Frankfurt in the German state of Brandenburg, known as Frankfurt (Oder). It is also called Frankfort-on-the-Main in English, a translation of Frankfurt am Main.