is the capital and largest city of the German state of Baden-Württemberg. Stuttgart is located on the Neckar river in a fertile valley known locally as the "Stuttgart Cauldron". It lies an hour from the Swabian Jura and the Black Forest. Its urban area has a population of 634,830, making it the sixth largest city in Germany. 2.8 million people live in the city's administrative region and 5.3 million people in its metropolitan area, making it the fourth largest metropolitan area in Germany. The city and metropolitan area are consistently ranked among the top 20 European metropolitan areas by GDP; Mercer listed Stuttgart as 21st on its 2015 list of cities by quality of living, innovation agency 2thinknow ranked the city 24th globally out of 442 cities and the Globalization and World Cities Research Network ranked the city as a Beta-status world city in their 2014 survey.