The Expo Zaragoza 2008 was the international exhibition that took place in Zaragoza, the theme was water and its integration into sustainable development. 100 countries participated, there were many other activities such as the celebration of the country. The 100 participating countries each had a day when they got to meet and celebrate. The exhibition was held between two expositions, such as Sevilla, 1992. The fair was located on the banks of Rivergate, a bend of the river Ebro, not far from the city center. Every country built a "home", a representative building, with water environments, their savings and optimizing it.