The sea is at a particular level compared to land. Most land is above sea level (or it would be under the sea or very far inland).
If you are a mile above sea level, then you are a mile above where the sea would be if there was no land there.
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A mile above sea level means that the point is located 5,280 feet (or approximately 1,609 meters) higher than sea level. This measurement is used to indicate altitude or elevation, typically in relation to mountain peaks or other landmarks.
Not even a mile. The new island, Anak Krakatau extends about 860 feet above sea level. Rakata, a remnant of the original island, goes to about 2,400 feet above sea level which is still less than half a mile.
Mount Vesuvius is 1,281 meters (4,203 feet) above sea level.
The level of the ocean's surface is called sea level. It serves as the baseline for measuring elevation and depth.
The elevation of 2400 feet is approximately 731.52 meters above sea level.
Welwyn Garden City is approximately 110 meters above sea level.