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1000 feet above sea level.
Mount Taal is approximately 1,020' (311 m) above sea level. Mount Taal is located in the Philippines and currently has 47 craters.
sea level
Mean sea level (MSL) which is the average level of the sea. Determinig "sea level" is a very complex measurement. All other altitude measurements in aviation, in one way or another, are referenced from the mean sea level.
7,310 ft above sea level
110 metres above sea level
9.8′ above sea level
at sea level
Oxford is 129m above sea level
It is 781 feet above sea level.
It is 544 feet above sea level.
325 feet above sea level.
Part of it is at sea level. The highest point is 18.04 ft above sea level.
500 ft above sea level
0 to 12 m above sea level (it is just on the shores of the Caribbean Sea).
Key West is 18 feet above sea level.
They are measured by how far above the ocean they are. The ocean is called "sea level". Sea level is 0.