The Perl River or Perlovska River is a small river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in the Sofia Valley

Sofia Valley

The Sofia Valley is a valley in central western Bulgaria, bordering Stara Planina to the northeast, the Viskyar, Lyulin, Vitosha and Lozen mountains to the southwest, the Vakarel Mountain to the southeast and the low Slivnitsa Heights to the northwest....

 in western Bulgaria

Bulgaria

Bulgaria , officially the Republic of Bulgaria , is a parliamentary democracy within a unitary constitutional republic in Southeast Europe. The country borders Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, as well as the Black Sea to the east...

. The river is only 17.8 kilometres (11.1 mi) long. It takes its source from the foothills of Vitosha

Vitosha

Vitosha is a mountain massif, on the outskirts of Sofia, the capital of Bulgaria. Vitosha is one of the tourists symbols of Sofia and the closest site for hiking, alpinism and skiing. Convenient bus lines and rope ways render the mountain easily accessible. Vitosha has the outlines of an enormous...

, runs through Sofia

Sofia

Sofia is the capital and largest city of Bulgaria and the 12th largest city in the European Union with a population of 1.27 million people. It is located in western Bulgaria, at the foot of Mount Vitosha and approximately at the centre of the Balkan Peninsula.Prehistoric settlements were excavated...

s South Park, separates the two lanes of Evlogi Georgiev Boulevard

Evlogi Georgiev Boulevard

Evlogi Georgiev Boulevard is an important boulevard in the Bulgarian capital Sofia. It is named after the Bulgarian entrepreneur Evlogi Georgiev. It begins with its intersection with the Cherni Vrah Boulevard and Fridtjof Nansen Street in the area of the National Palace of Culture...

, runs through the neighbourhood Poduyane

Poduyane

Poduyane or Poduene is a residential complex and a district of Sofia, the capital of Bulgaria with 85,996 inhabitants. It is located in the eastern outskirts of the city and is divided into microregions. Poduyane consists of the neighbourhoods Suhata Reka, Hadzhi Dimitar, Poduyane, Stefan...

, and finally flows into the Iskar

Iskar

The Iskar is, with a length of 368 km, the longest river that runs solely in Bulgaria, and a tributary of the Danube.The Iskar is formed by three rivers, the Cherni Iskar, Beli Iskar and Levi Iskar , with the source being accepted to be the Prav Iskar, a tributary of the Cherni Iskar...

 river.
The well known Orlov Most

Orlov most

Eagles' Bridge is a bridge over the Perlovska River in the centre of Sofia, the capital of Bulgaria. It gives the name to the important and busy juncture at which it is located...

is build over this river.