Baku
Along the western and southern shores of the Caspian Sea, there are mountains (specifically the Caucasus, Alish, and Elburz Mountain Ranges going counterclockwise), but on the northern and eastern shores of the Caspian Sea, there are lowlands, some which are below sea-level.
Baku is the capital and largest city of Azerbaijan. Baku is located on the Caspian Sea.
Baki, sometimes (sometimes Baku) is the leading oil city on the western shore of the Caspian Sea.
It depends on whether we call it the Caspian Lake, now I think you'll find it is called the Caspian Sea......
The river in Russia that flows in the Caspian sea is called River Volga. The river in Russia that flows in the Caspian sea is called River Volga.
Mumbai
The Mediterranean Sea.
It flows to the Caspian sea.
The caspian sea.
It runs through the lowlands [desert] to the Caspian Sea
You could call the Caspian Sea an inland sea. It's also technically the world's largest lake, which is why Lake Superior is called the world's largest freshwater lake.
The Caspian Sea is inside the European arid region (or desert). That is how the two are related to each other.