At the foot of mountain Kruglaya there is a Travertine Shield, which is one of the main attractions of Nalychevo Park. Travertine is a rock composed of minerals of calcium carbonate. In the process of perennial deposits of carbon dioxide sources, a travertine shield was formed, occupying an area of about fifty square kilometers. On the surface you can see only its part in the form of a dome, called the Kotyol. The Kotyol is surrounded by thermal marshes, and Ivanov's griffin flows from its eastern side - a well drilled in 1959, the water temperature in it is 70-75 degrees.