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Boyuk Zira is an island in the Caspian Sea. It is one of the islands of Baku Archipelago located in the Baku bay near Baku city. Nargin Island is part of the Baku Archipelago, which consists of the following islands: Boyuk Zira, Dash Zira, Qum Island, Zenbil, Sangi-Mugan, Chikil, Qara Su, Khara Zira, Gil, Ignat Dash and a few smaller ones. Boyuk Zira is the biggest island that separates the Bay of Baku from the sea south of the Absheron Peninsula. It has a length of 3.1 km, and a width of 900 m. The northwestern side of the island is vertical and steep. There is little vegetation. Caspian seals, sturgeon, and numerous types of birds, such as teal ducks, herring gulls, and grebes are some of the species that can be found on and around Boyuk Zira Island.
Most of the names of islands in the Baku archipelago, including Boyuk Zira, were changed by the Russians and partially by Cossacks, who appeared in the Caspian Sea region in the 17th century. Boyuk Zira was also called Nargin, which is related to the name given by Peter the Great. The shape of this island reminded the Russian emperor of the island Nargen (now Naissaar) near Tallinn in the Gulf of Finland.