Black Sea which are largely responsible for regional precipitation inputs and influence Mediterranean Sea Surface Temperatures (SST's). The relative strength of these systems also limits the amount of cold air arriving from northern regions during winter. Other influencing factors include the regional topography, as depressions and storms systems arriving from the Mediterranean are funneled through the low land around the Bosphorus, Pontic and Caucasus mountain ranges acting as wave guides, limiting the speed and paths of cyclones passing through the region. There are some islands in the Black sea that belong to Bulgaria, Romania, Turkey, and Ukraine: The Black Sea is connected
Black Sea–Caspian Steppe Azov broke off and formed the Lesser Nogai Horde, a name that gradually went out of use. Around 1630 the Kalmyks migrated west from Dzungaria and occupied the land around the north end of the Caspian Sea, driving the Nogais south and west. In 1771 a significant part of them returned to Dzungaria and the Nogais returned east and north. A few Russians were on the lower Terek by about 1520 and Cossacks were somewhere on the Don by 1550. In 1556 Russia took Astrakhan and interacted with Kabardia for a few years before losing interest in the area south