Kizlyar Bay is a bay

Bay

A bay is an area of water mostly surrounded by land. Bays generally have calmer waters than the surrounding sea, due to the surrounding land blocking some waves and often reducing winds. Bays also exist as an inlet in a lake or pond. A large bay may be called a gulf, a sea, a sound, or a bight...

 of the Caspian Sea

Caspian Sea

The Caspian Sea is the largest enclosed body of water on Earth by area, variously classed as the world's largest lake or a full-fledged sea. The sea has a surface area of and a volume of...

 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.

The Kuma

Kuma River (Russia)

The Kuma is an long river in southern Russia. Its drainage basin is 33 500 square km. Its source is in the Greater Caucasus, in the republic Karachay-Cherkessia, west of Kislovodsk...

, Prorva and Talovka rivers discharge into the bay, reducing the salinity to 5 PPT. The Dagestan Nature Reserve covers the entire area of the gulf, including the island of Morskoy Biryuchok. The hinterland is low and marshy.

If the plans for the proposed Eurasia Canal

Eurasia Canal

The Eurasia Canal is a proposed 700-kilometre long canal connecting the Caspian Sea to the lower Black Sea along the Kuma-Manych Depression, which is often considered the border between Europe and Asia...

, linking the Caspian Sea with the Black Sea

Black Sea

The Black Sea is bounded by Europe, Anatolia and the Caucasus and is ultimately connected to the Atlantic Ocean via the Mediterranean and the Aegean seas and various straits. The Bosphorus strait connects it to the Sea of Marmara, and the strait of the Dardanelles connects that sea to the Aegean...

, are ever implemented, it will likely have the Kizlyar Bay as its eastern end.