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.

Global sea level rose faster than expected. Visualize and access information and data relevant to understanding and planning for sea level rise in response to ongoing climate change. Visualize and …

Use this web mapping tool to visualize community-level impacts from coastal flooding or sea level rise (up to 10 feet above average high tides). Photo simulations of how future flooding might impact local …

An interactive sea level map with the latest data on past, present, and future sea level rise for every coastal location. Explore IPCC AR6‑based sea level rise projections, satellite and tide gauge …

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, atmospheric …

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 and low tides.

Dec 14, 2025 · A vast number of coastal cities in the U.S. would be submerged in water if sea levels rise 10 feet, according to a map by NOAA.

Sep 25, 2025 · The graph tracks the change in global sea level since 1993, as observed by satellites. This data includes the seasonal cycle of global sea level, visible as a rise and fall each year.

Sea level continues to rise at a rate of about one-eighth of an inch per year. Higher sea levels mean that deadly and destructive storm surges push farther inland than they once did, which also means more …

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.