Ichen introduction: The core part of the ancient city of Khiva is the inner city "Ichen-Kala", which has been listed as a World Heritage Site. The north and south walls of the inner city are each 650 meters long, and the east and west walls are each 400 meters long. The area is not large. In 1740, the Persians invaded and Yiqin was reduced to ruins. It was only restored in the 19th century AD. Itchenne City is a unique Islamic city and cultural expo city, where all historical monuments are well preserved.