The Danube is the second longest river in the European Union, located in Budapest, Hungary. It is nicknamed the River Capitals because it passes through Vienna, Bratislava, Budapest and Belgrade, and the river crosses or borders 10 European countries. It's a great place to take a walk and enjoy the beautiful scenery, or take a break at one of the riverside restaurants. It is the place where many locals flock to in order to have a rest, relax and get away from the hustle and bustle of the city.