Vitosha Stone River or Zlatnite Mostove is the largest stone river on Vitosha Mountain, Bulgaria. The feature is situated in the valley of Vladayska River, extending 2.2 km, and up to 150 m wide, with several ‘tributary’ stone rivers.
A stone river is a rock landform resulting from the erosion of particular rock varieties caused by freezing-thawing cycles in periglacial conditions during the last Ice Age. The actual formation of stone runs involved five processes: weathering, solifluction, frost heaving, frost sorting, and washing.
The stone runs are essentially different from moraines, rock glaciers, rock flows, or other rock phenomena involving the actual flow of rock blocks under stress that is sufficient to break down the cement or to cause crushing of the angularities and points of the boulders. By contrast, the stone run boulders are fixed quite stably, providing for safer climbing and crossing of the run.
The stone river is ‘descending’ from elevation 1800 m above sea level in the Boeritsa Chalet area to 1410 m at the Zlatnite Mostove site. The lower extremity of the stone river is known as the Zlatnite Mostove site, a popular tourist destination accessible from Sofia by road.