Duhlata is situated in the south-western area of Vitosha on the left bank of the river Struma near the village of Bosnek, Pernik Province.

Duhlata is one of the most complex cave systems in Bulgaria and was created by underground currents of the Struma River.

It is a maze of tunnels, galleries, underground lakes, waterfalls and sinter formations situated at seven levels.

The diversity of worms (Nematoda, Oligochaeta), snails (Mollusca) and seed shrimps (Ostracoda) has not been studied.

Duhlata can be visited only by researchers or experienced cavers with permission by Vitosha Nature Park Directorate.