Peter Kropotkin and John Bealby, 1911 Encyclopædia Britannica, Volume 10… (1911)
“ These streams, and their numerous mountain affluents, not only supply water for irrigation, but also bring down vast quantities of sand, which is deposited alongside their courses, more especially alongside the Syr-darya where it cuts its way through the Khojent-Ajar ridge, forming there the Karakchikum. This expanse of moving sands, covering an area of 750 sq. m., under the influence of south-west winds, encroaches upon the agricultural districts. The climate of this valley is dry and warm. ”
