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The article examines recent Caspian Sea level change by using both satellite radar altimetry and satellite gravity data. The altimetry record for 2002–2015 shows a declining level at a rate that is approximately 20 times greater than the rate of global sea level rise. Seasonal fluctuations are also much larger than in the world oceans. With a clearly defined geographic region and dominant signal magnitude, variations in the sea level and associated mass changes provide an excellent way to compare various approaches for processing satellite gravity data. 

“The Caspian Sea Encyclopedia” is the second one in the new series of encyclopedias about the seas of the former Soviet Union published by Springer-Verlag. The first volume – “The Aral Sea Encyclopedia” was published by Springer in 2009. The series will be continued by “The Black Sea Encyclopedia” in 2010.