The south coast of England is a submergent coastline, and contains many rias, including Portsmouth harbour, Southampton water, Poole harbour; the estuaries of the Exe, Teign and Dart, the Kingsbridge estuary, and Plymouth Sound in Devon; and the estuaries of the River Fowey and River Fal in Cornwall. Chesapeake Bay and Delaware Bay, on the east coast of the United States are rias.
The Kingsbridge estuary is an extreme example of a ria forming an estuary disproportionate to the size of its river, because no river at all flows into it, only a number of small streams.