On the Imin River, located on the territory of the Chinese Autonomous Region of Inner Mongolia, a perfectly round ice circle, slowly rotating on the water, was discovered.
The diameter of the ice circle is 4 meters. Tourists even ridden on this circle. According to the hypotheses of scientists, these circles are formed because of the vortex flows of water. The largest of such ice circles was found on Lake Baikal, its diameter was 4 kilometers.