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Sea level

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The sea level is the average height of the ocean (informally called the sea). The word 'average' must be used because the height of the sea changes with the tides.

The height of mountains, countries, and so on, is almost always given as "above sea level".

Sea level rises

Global warming means that the Antarctic and Greenland ice sheets are melting and the oceans are expanding. Sea level rises could easily top a metre by 2100. Low-lying areas such as Bangladesh, Florida and the Netherlands face massive flooding.[1]


  1. Scientists to issue stark warning over dramatic new sea level figures

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