Chil-Ustun

Chil-Ustun Cave also known as Aravan Cave is located in the Southwest of Kyrgyzstan in the Osh Mountains, composed of Paleozoic limestones, in 3.5 km from Aravan, Kyrgyzstan. It is a protected natural monument. The cave belongs to the group of Karst caves of outlier mountains to the west of Osh.
The entrance to the cave forms a and approximately arc. The cave is 380 meters long or up to 350 meters according to another source. It is located in a rock formation at 1100 meters above sea level. The entrance is located on a steep, oblique rock face.
The cave's existence has been known since mediaeval times as attested by Arabic inscriptions on the walls.
The cave consists of 3 chambers of different sizes, connected with corridors and narrow openings. The largest chamber is 85 m × 40 m × 20 m in size.
Inside the cave, stalactites and stalagmites reach heights of over 50 meters. These forms vary in color, from white and cream to dark brown.