Caspian Sea and a Pleistocene stage, that includes glaciation cycles and the creation of the present Volga River. During the first stage, the Tethys Sea had evolved into the Sarmatian Lake, that was created from the modern Black Sea and south Caspian, when the collision of the Arabian peninsula with Western Asia pushed up the Kopet Dag and Caucasus Mountains, setting definitive south and west boundaries to the Caspian basin. This orogeneic movement was continuous throughout the years, while Caspian was regularly disconnecting from the Black Sea. In the late Pontian, a mountain arch rose across the south basin and divided it
Caspian Sea Turkic languages refer to the lake as "Khazar Sea". In Turkmen, the name is , in Azeri, it is , and in modern Turkish, it is . In all these cases, the second word simply means "sea", and the first word refers to the historical Khazars who had a large empire based to the north of the Caspian Sea between the 7th and 10th centuries. An exception is Kazakh, where it is called , "Kaspiy teñizi" (Caspian Sea). Renaissance European maps labelled it as "Abbacuch Sea" (Oronce Fine's 1531 world map), "Mar de Bachu" (Ortellius' 1570 map), or "Mar de