In earth science a submergent coastline is a coastline which has experienced a rise in sea level, due to a global sea level change, local subsidence, or isostatic rebound. Submergent coastlines are identifiable by their submerged, or "drowned" landforms, such as rias (drowned valleys) and fjords.

Examples of submergent coastlines include:

• the Baltic coastline
• the eastern United States around Chesapeake Bay
• southern England
• the coastline of Norway
• the coastline of Croatia
• the coastline of Greece

Landforms