The Spreelauf is a German

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 ultramarathon

Ultramarathon

An ultramarathon is any sporting event involving running longer than the traditional marathon length of .There are two types of ultramarathon events: those that cover a specified distance, and events that take place during specified time...

 race. In six days, runners compete over a total distance of 420km (261 miles), 10 times the traditional marathon distance. The Spreelauf starts in Spandau

Spandau

Spandau is the fifth of the twelve boroughs of Berlin. It is the fourth largest and westernmost borough, situated at the confluence of the Havel and Spree rivers and along the western bank of the Havel, but the least populated.-Overview:...

 (Berlin

Berlin

Berlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...

) and follows the river Spree

Spree

The Spree is a river that flows through the Saxony, Brandenburg and Berlin states of Germany, and in the Ústí nad Labem region of the Czech Republic...

 upstream to one of its three sources in Eibau (Upper Lusatia

Lusatia

Lusatia is a historical region in Central Europe. It stretches from the Bóbr and Kwisa rivers in the east to the Elbe valley in the west, today located within the German states of Saxony and Brandenburg as well as in the Lower Silesian and Lubusz voivodeships of western Poland...

).

The Spreelauf is organized by Ingo Schulze, well known in the ultramarathon scene as the organizer of the TransEurope-FootRace and the Deutschlandlauf