CAVES
   Though karst bedrock accounts for a relatively small part of the protected area, it is the scene of many deep caves and precipices.
   Remarkable for its bottomless caves is Steneto Reserve, where Raichova Dupka, the deepest precipice cave in Bulgarian (377 m. in depth, 3,333 m. combined length of all galleries) is located; also here is Kumanitsa, the longest flooded cave in Central Balkan (1,656 m. explored length, average outflow of the underground river 600 liters per second).
    The caves and canyons, the rock faces and cliffs are inhabited by sic species of bats endangered on a world scale, by a number of petrophilic birds, and by various rare and beautiful plants.

The vertical Pticha Dupka cave is situated in Eastern Troyan Balkan and could be called a “pearl” among the Troyan cave because of its exclusive beauty.

The Han Maara cave (house-cave) is the largest cave in the Kalofer region of the Central Balkan area.

The cave is in the site of Mazeto in the Troyan Balkan to the west of the Troyan pass. Its length is 367 m and the displacement – 11 m. The altitude of its entrance is 1350m.

The unique rock bridge Krali Markova Hole is a cave in its last stage of its development when most of its limestone walls have been aeolated and “dissolved” in the water and such it became a passage cave, e.g. - rock bridge.

The Kumanitsa cave is located in the eastern part of the Troyan Balkan in Steneto reserve at the left riverbank of Kumanitsa River (this is the name if the upper stream of Cherny Osam river from its springs to the water catchment), in the narrowest and most picturesque part of the canyon over the beautiful waterfall Golemyat Kazan.

The precipice Raychova Dupka cave is located in the Eastern section of the Troyan Balkan in the Steneto Reserve, along the upper stream of Malak Chaushov Dol creek as the altitude of its entry is 1400 m.

Leaving Rai hut hiking to the North of the crest of Kupenite peaks, in the foot of the rocky slopes the valley of Golyama Bazovitsa is seen. Rogachevata Pestera cave is high above the gully – at an altitude of 1700 m.

The cave is located 7 km away of Hristo Danovo village in Yulen Dere. The size of its entrance is 1,2 x 1 m and a stream flows out of it all-year-round. It further flows along the slope and flows into a river streaming down the gully.

The cave is located to the south-east of Pleven hut, along the northern slope of the massif of the peak of Botev. The first study and mapping of Vodnite Dupki was carried out in 1961. In 1982 it was studied and mapped in detail by the Caving Club Studenets (Pleven).

The Rushova peshtera cave near the village of Glogovo is a real pearl among caves. A special group of speleologists studied the cave back in 1951.