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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.
Red circles show the location and size of many dead zones (in 2008). Black dots show dead zones of unknown size. The size and number of marine dead zones—areas where the deep water is so low in dissolved oxygen that sea creatures cannot survive (except for some specialized bacteria)—have grown in the past half-century.
The older hypothesis is that the Dead Sea lies in a true rift zone, an extension of the Red Sea Rift, or even of the Great Rift Valley of eastern Africa. A more recent hypothesis is that the Dead Sea basin is a consequence of a "step-over" discontinuity along the Dead Sea Transform, creating an extension of the crust with consequent subsidence.
The World Ocean. For example, the Law of the Sea states that all of the World Ocean is "sea", [8] [9] [10] [b] and this is also common usage for "the sea". Any large body of water with "Sea" in the name, including lakes. River – a narrow strip of water that flows over land from a higher elevation to a lower one
Upon a bloom's conclusion, the dead algae sink to the bottom and are broken down until all oxygen is expended. Such a case is the Gulf of Mexico where a seasonal dead zone occurs, which can be disturbed by weather patterns such as hurricanes and tropical convection.
Kashagan Field (Kazakh: Қашаған кен орны, Qaşağan ken orny) is an offshore oil field in Kazakhstan's zone of the Caspian Sea. [2] The field, discovered in 2000, is located in the northern part of the Caspian Sea close to Atyrau and is considered the world's largest discovery in the last 30 years, combined with the Tengiz Field. [3]
Every spring, an area appears when the water doesn't have enough oxygen to support fish and other marine life.
Caspian seal (Pusa caspica). Caspian seals (Pusa caspica) and varied marine birds inhabit the island. Ogurja Ada is part of the Hazar Nature Reserve of Turkmenistan. [5]The island has been designated an Important Bird Area (IBA) by BirdLife International because it supports breeding colonies of gulls and terns.