Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth 's coastal bodies of water from which heights such as elevation may be measured.

May 30, 2025 · Sea level is the base level for measuring elevation and depth on Earth. Because the ocean is one continuous body of water, its surface tends to seek the same level throughout …

Jun 3, 2020 · But what really matters to people at the coast are long-term changes in their relative sea level – that is, the height of the ocean relative to the land. Those are caused by the overall …

Jul 8, 2019 · What is sea level and what does sea level actually mean? Discover the meaning of sea level and how rising sea levels can impact our planet.

Nov 25, 2013 · Sea level seems like a pretty easy concept, right? You just measure the average level of the oceans and that's that. But what about parts of the Earth where there aren't oceans?

Jun 16, 2025 · Sea level is often perceived as a fixed horizontal line, but it is, in reality, a complex and dynamic surface representing the average height of the ocean’s surface between high …

Sea level, position of the air-sea interface, to which all terrestrial elevations and submarine depths are referred. The sea level constantly changes at every locality with the changes in tides, …

Dec 9, 2025 · The meaning of SEA LEVEL is the level of the surface of the sea especially at its mean position midway between mean high and low water.

Aug 10, 2017 · Sea level is a measure of the average height of the surface of the sea. Like land, the surface of the ocean is not flat or uniform. But unlike land – for the most part – it can …

The level of the ocean's surface. Sea level at a particular location changes regularly with the tides and irregularly due to conditions such as wind and currents.