A sea generally refers to a large body of salt water, but the term is used in other contexts as well. Most commonly, the term refers to a large expanse of saline water connected with an ocean, and is commonly used as a synonym for ocean. It is also used sometimes to describe a large saline lake that lacks a natural outlet, such as the Caspian Sea.

List of Seas Wikipedia

Seas Wikipedia

Scientists drill beneath Dead Sea in search of priceless data   PhysOrg - December 22, 2010
Rock samples that have been underwater for millions of years are likely to be better preserved, they say, than samples taken from under an exposed surface, which can be damaged by aridity and erosion. As a result, the Dead Sea bore hole is expected to contain priceless information about the planet's past and to offer insight on its future. Expectations are high that the lowest place on Earth can answer questions on climate change, earthquake risk and untapped natural resources.

Mediterranean most threatened sea on Earth   PhysOrg - August 2, 2010

Mediterranean Sea Getting Saltier, Hotter   Live Science - May 24, 2010

Red Sea coral reefs get their complex shape from an ancient 'seabed template'.   BBC - February 23, 2010

Colossal Flood Created the Mediterranean Sea   Live Science - December 9, 2009

Ancient Mediterranean flood mystery solved   BBC - December 9, 2009