Berlin lies in northeastern Germany, east of the River (Saxon or Thuringian) Saale, that once constituted, together with the River Elbe (from their confluence onwards), the eastern border of the Frankish Realm. While the Frankish Realm was primarily inhabited by Germanic tribes like the Franks and the Saxons, the regions east of the border rivers were inhabited by Slavic tribes. Berlin is a “Global city” world city of culture, politics, media and science. Its economy is based on “High tech” high-tech firms and the service sector, encompassing a diverse range of “Creative industries” research facilities, media corporations and convention venues. Berlin serves as a continental hub for air and rail traffic and has a highly complex public transportation network. The metropolis is a popular “Tourism in Germany” tourist destination. Significant industries also include “Information technology” IT, pharmaceuticals, biomedical engineering, clean tech, ” biotechnology, construction and electronics.Berlin is home to world-renowned universities, orchestras, museums, and entertainment venues, and is host to many sporting events. Its Zoological Garden is the most visited zoo in Europe and one of the most popular worldwide. With the world’s oldest large-scale movie studio complex, Berlin is an increasingly popular location for international film productions. The city is well known for its festivals, diverse architecture, nightlife, contemporary arts and a very high quality of living. Since the 2000s Berlin has seen the emergence of a cosmopolitan entrepreneurial scene.