The Miljacka () is a river in Bosnia and Herzegovina that passes through Sarajevo. Numerous city bridges have been built to cross it. Characteristics The Miljacka river originates from the confluence of the Paljanska Miljacka and Mokranjska Miljacka rivers. The Miljacka is a rather small river, only long from the confluence, or and depending on source (Pale or Mokro). By the time this tributary flows into the Bosna river in Sarajevo, it has an average discharge of 5.7 m³/s. The Miljacka river flows from east to west in a general direction through the city. The Bosna is a right tributary of the Sava River, with its mouth in Bosanski Šamac. That river in turn flows into the Danube River, which goes southeast and enters the Black Sea chiefly in Romania. Paljanska Miljacka The Paljanska Miljacka, in length, begins at Gornje Pale, eastward in the town of Pale, under the slopes of Jahorina, near Begovina), at an elevation of . Mokranjska Miljacka The Mokranjska Miljacka, in length, springs from a large cave, yet to be fully explored, near the village of Kadino Selo at an elevation of near the base of Romanija mountain. Mokranjska Miljacka cave The cave at the spring of Mokranjska Miljacka, located about from the village of Mokro, near Pale, is officially the longest cave in Bosnia and Herzegovina. As of August 2015, the length of mapped caverns was . The Miljacka runs out of the cave practically as an underground flow, a subterranean river, where its temperature is measured as low as 5 degrees and temperature of air as low as 8 degrees Celsius. The exact location of the cave is not yet mapped for the public, but local authorities have released a map which can be used to find its location, as well as a gallery of discoveries within the cave. A new species of spiders, named Nemanela Lade ("Lada's Little Monster" for its discoverer, Dr. Lada Lukić-Bilela from the Institute for Genetic Technology, Sarajevo), has been found here. Also found are at least five more species of spider, as well as certain species of bats. A skeleton head of a cave bear has also been found at the location. Paleontological finds, traces of human habitation, stalactites and stalagmites, as well as pisolite rocks, the river Miljacka wellspring, all makes this cave among most valuable speleological objects in Bosnia and Herzegovina. Researchers believe to have discovered