Berlin has developed a highly complex transportation infrastructure providing very diverse modes of urban mobility. 979 bridges cross 197 kilometers of innercity waterways, 5,334 kilometres (3,314 mi) of roads run through Berlin, of which 73 kilometres (45 mi) are motorways. Long-distance rail lines connect Berlin with all of the major cities of Germany and with many cities in neighboring European countries. Regional rail lines provide access to the surrounding regions of Brandenburg and to the Baltic Sea.