Your experience begin at 08:00 am. We will pick-up from your hotel. Drive to Zlatna Panega river (1 hours approx.). There are many karst springs in Bulgaria, among all the springs, there is one that is distinguished by the largest water quantities and scale – the Glava Panega spring in the Pre-Balkans, which gives the beginning of the Panega River (a right tributary of the Iskar River). The karst spring itself forms two lakes: upper and lower. To the Spring you will through cave. We will continue to Ecotrail Iskar – Panega. The eco trail is around 16 km but we will see only first kilometers of the eco trail. At the end of the first part, there is an option wo take boat to the end of the trail. After that we will return back and continue to the visit Prohodna cave. We will make a short walk. At the end of the day we will take the car back to Sofia.