The Khorezm oasis is an area of the Amu Darya river delta, which is situated in Western Uzbekistan north of Khiva and Turkmenistan. Khorezm was an independent state from around the 4th century BC which is when the building of the forts began.
Approximately 50 forts were built; the ruins of eight still survive which were still being fortified until the Mongolian attacks began in 1219.
We hiked up three forts including Topraq Kala which archaeologists have discovered also incorporated a royal palace. From the top of Ayaz Kala we had an excellent view of the second Ayaz Kala (there are three in total, the third is visible but a ruin).
Shilli-Fully Travels 