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The Rocks close to Ustra village
The Rocks close to Ustra village They are also called the rock formations near Kaleto area. This natural phenomenon is located on the southern slope of Ustra peak at the foot of which lies the village of Ustren. The rock formations are made out of beautiful grey and grey-violet rhyolites. They are huge sharp rock peaks with prismatic, step-like and conical shapes. They are from 5m to 15m high, some even more and forming original rock compositions. In 1972 they were designated as a protected monument with area of 224decares. Some interesting plant species occur in the surrounding area. Right behind the rock formations and along their northern slopes is located the only in the region field of two high altitude mountain plants – cornel stick (Cotoneaster intergerimus) and Amelanchier ovalis from Rosaceae family. At the same place but in the cracks of the rocks is the second in Bulgaria field of the rare species of Silene lerchenfeldiana from Caryophyllaceal family. That plant usually occurs at altitudes higher than 2000m and Ustra peak is 1015m high. A big field of the valuable herb golden rod (Solidago virga aurea) and other rare species were also discovered. Note: The place is suitable for tourism
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