Despite the Alps, Austria has historically been a land of transit. The Danube valley, for centuries Central Europe's aquatic link to the Balkan Peninsula and the "Orient" in the broadest sense of the word, has always been an avenue of east–west transit. However, Europe's division into two opposing economic and military blocs after World War II diminished Austria's importance as a place of transit. Since the opening of Eastern Europe in 1989, the country has begun to re-assume its historical role. By the early 1990s, it had already experienced a substantial increase in the number of people and vehicles crossing its eastern frontiers.