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  Sea

To geographers the word sea means a division of the ocean that is enclosed or partly enclosed by land. Enclosed seas, such as the Mediterranean and the Baltic, are connected to the open ocean by straits. Partly enclosed seas like the North Sea are joined to the ocean by wide openings; others like the South China Sea connect by passages between islands. These partly enclosed seas resemble the open ocean in their range of tides. Using this definition, there are more than 50 seas on earth, but many so-called seas, like the Dead Sea, are really lakes. Although composed of salt water, these “seas” have no access to the ocean.