What does continental shelf mean in seafloor geography?
In physical geography, the continental shelf is the submerged, generally gently sloping edge of a continent. It extends from the coast to the shelf break, where the slope increases markedly. Its width varies greatly between coastlines.
Development of the shallow seafloor
Tectonic history, river sediment and past sea-level changes influence shelf shape. Some parts were exposed as land during lower sea levels and later flooded again. Former river courses and shoreline features can therefore survive on the seabed. A shelf is not a perfectly flat step ending at the same depth everywhere.
Difference from the continental slope
Beyond the shelf break, the steeper continental slope generally leads toward deep-ocean areas. Shelves matter for light availability, nutrient transport and habitat diversity, although productivity varies. This description concerns physical geography. The continental shelf in maritime law is defined through legal criteria and need not coincide exactly with the geomorphological shelf boundary. The two meanings should not be used interchangeably.