Linked from
The 36 pages that link to Continental shelf, each with the reason it gives.
Continental crustBroader topic: It is a submerged part of the continental margin, not oceanic crust.
Submarine canyonBroader topic: Some canyon heads begin on shelves, close to shore.
Passive marginBroader topic: It is the shallowest major zone of a typical passive margin.
OceanBroader topic: It marks the shallow underwater margin where continents meet ocean basins.
ContinentsBroader topic: Including shelves expands a continent beyond the land visible above water.
SeabedBroader topic: This broad, relatively shallow seabed borders continents.