Valchanova cave is located near the village of Skrebatno. It is named after Vulchan Voivoda, who used it with his troops for shelter. He was born in Strandzha, led a detachment at a young age, which according to legend made the biggest robberies in the Ottoman Empire. Valchan became the richest voivode.
For the easiest and quickest way to find the cave, ask the locals for directions.