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To fill the Caspian basin to a level of more than 50 metres (160 ft) would require as much as 70,000 km 3 of water, equivalent to 200 years of river discharge into the Caspian Sea. Water flowed through the Manych Spillway (250 to 1,000 km 3 per year) and some (more than 100 km 3 per year) was lost through evaporation.
The Caspian Sea is the world's largest inland body of water, described as the world's largest lake and usually referred to as a full-fledged sea. [2] [3] [4] An endorheic basin, it lies between Europe and Asia: east of the Caucasus, west of the broad steppe of Central Asia, south of the fertile plains of Southern Russia in Eastern Europe, and north of the mountainous Iranian Plateau.
The delta is located in the Caspian Depression—the far eastern part of the delta lies in Kazakhstan. The delta drains into the Caspian approximately 60 km (37 mi) downstream from the city of Astrakhan. The Volga delta has grown significantly in the 20th century because of changes in the level of the Caspian Sea.
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Mt. Laurel–Wenonah aquifer; Ogallala Aquifer, also known as the High Plains Aquifer; Ozark Plateau aquifer; Patapsco aquifer; Permian Sea; Potomac–Raritan–Magothy aquifer; Saginaw Aquifer; San Diego Formation [1] San Joaquin River aquifer; Sankoty Aquifer; Silurian–Devonian aquifers; Spokane Valley–Rathdrum Prairie Aquifer [2] [3]
In Ptolemy’s map, Baku was described far from the sea. After the 7th century, the water level of the Caspian Sea rose until the 9th century and since then, the formation of Baku bay began. [2] Severe changes happened at the end of the 8th century, when the Caspian Sea rose more than ten meters.
A map of the Caspian Sea drainage basin to which all rivers in Azerbaijan flow to The Kur and Aras are the longest rivers of Azerbaijan and their drainage basin covers most of the country. The Araz River along the Iranian border with Nakhchivan, Azerbaijan. Rivers form the principal part of the water systems of Azerbaijan.
The water level of the Caspian Sea has varied within 4 m over a period of 30 years. Water levels in the Caspian Sea down to true altitude of -29 m reduce the depth of the lower Volga and restrict ship movement in this part of the Volga-Don Waterway.