The desert mountains Big and Small Kalkans are located on the right bank of the Ili River between the Degeres Mountains located in the west and the Katutau Mountains in the east.
The Big and Small Kalkans surround the Singing Dune, thus protecting it from dispersal.
Big Kalkan rises 600 m above the surface of the Basshi valley and 800 m above the Ili River valley. The foot of Big Kalkan has the shape of an ellipse measuring 15 by 12.5 km.
Small Kalkan, 7.5 by 8 km in size, is located southwest of Big Kalkan and twice as low.






