A large expanse of low, level land, formed due to an uplift of part of the sea floor bordering a continent is called

A coastal plain forms when part of the sea floor rises up. It creates flat, low land along the edge of a continent.

Flood plains form from river flooding. Deltaic plains form where rivers meet the sea. Outwash plains come from melting glaciers.

Many major cities sit on coastal plains because the flat land is easy to build on.