 Sea level

The elevation of the ocean surface relative to a specified reference. Global mean, local relative and instantaneous levels answer different questions. Changes of basin capacity, water amount and surface topography can alter flooded continental shelf area and the distribution of marine environments.

Sea level refers to the average height of the ocean's surface, which serves as a baseline for measuring elevation and depth on Earth. It is considered a reference point for various purposes, including cartography, geography, and climate science.