The organisms, including coral reefs, that live in the Red Sea have adapted to life in salty water. The Red Sea, for instance, is much saltier than the Indian Ocean, to which it is connected by a narrow strait called Bab-el-Mandeb. Since there is little exchange of water between an enclosed sea and the open ocean, the two may differ from each other physically, chemically, and biologically. Because such seas are almost landlocked, they have a small range of tides. Seas of this type include the Mediterranean Sea and the Baltic Sea. Nearly enclosed seas reach deeply into continents and are connected with the open ocean by narrow waterways called straits. There are three major types of seas: nearly enclosed seas, partly enclosed seas, and hypersaline lakes. Some seas are called bays (like the Bay of Bengal, between India, Bangladesh, Myanmar, and Indonesia), while some lakes are called seas (like the Caspian Sea, shared by Azerbaijan, Iran, Kazakhstan, Russia, and Turkmenistan). For this reason, all seas are saline, or salty. To geographers, a sea is a division of the ocean that is enclosed or partly enclosed by land. People often use the term sea in reference to the ocean.
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