Intuition seems to suggest that the ocean should even itself out around the world. Interestingly, this is not the case. The sea is not the same height around the world; rather, local sea levels vary for a number of reasons. These reasons include the presence of ice sheets, changes in prevailing winds, differing ocean currents, the presence of coastal mountain ranges, and more. The global sea level measure is an average of the local sea levels around the world. The National Oceanic and Atmospheric Administration (NOAA) tracks the latest trends in sea levels. These trends are available for viewing via the NOAA website here.
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