query: What is the deepest point in the Caspian Sea?
passage: Caspian Sea
Differences between the three regions are dramatic. The Northern Caspian only includes the Caspian shelf,[15] and is very shallow; it accounts for less than 1% of the total water volume with an average depth of only 5–6 metres (16–20ft). The sea noticeably drops off towards the Middle Caspian, where the average depth is 190 metres (620ft).[14] The Southern Caspian is the deepest, with oceanic depths of over 1,000 metres (3,300ft), greatly exceeding the depth of other regional seas, such as the Persian Gulf. The Middle and Southern Caspian account for 33% and 66% of the total water volume, respectively.[12] The northern portion of the Caspian Sea typically freezes in the winter, and in the coldest winters ice forms in the south as well.[16]
passage: Kizlyar Bay
The Kizlyar Bay () is a bay of the Caspian Sea that cuts 20 km deep into the Republic of Dagestan. The bay is 40 km wide and has a maximum depth of 4 meters. The Tyuleniy Island lies near the entrance to the bay.