 | presence of numerous gorges, cliffs, water features and caves, including Raychova Dupka, the second-deepest cave discovered in Bulgaria and in the mountain... 47 KB (4,808 words) - 18:27, 8 April 2024 |
 | "Raychova Dupka Cave". The Caves of Bulgaria. Retrieved 20 May 2018. "Razhishka Cave". The Caves of Bulgaria. Retrieved 20 May 2018. "Saeva Dupka Cave"... 22 KB (724 words) - 11:12, 20 April 2024 |