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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 DevonThis page is about the English county, for alternative meanings see Devon (disambiguation). Devon is a county in South West England, bordering on Cornwall to the west, Dorset and Somerset to the east. The name Devonshire was common but is no longer used,; and the estuaries of the River FoweyThe River Fowey is a river in Cornwall, England. It rises west of Liskeard, passes Lanhydrock House, Restormel Castle and Lostwithiel, then broadens at Milltown before joining the English Channel at Fowey. It is navigable only for the last 7 miles. There and River FalThe River Fal flows through Cornwall reaching the English Channel at Falmouth Fal, River. in CornwallCornwall ( Cornish: Kernow is the part of Great Britain's south-west peninsula that is west of the River Tamar. It is generally regarded as a county of, and a part of England, although advocates of Cornish independence regard it as a separate nation, and. Chesapeake BayThe Chesapeake Bay is the largest estuary in the United States. It lies off the Atlantic Ocean, surrounded by Virginia and Maryland. The Chesapeake Bay's watershed covers 64,000 miles² (165,760 km²) in the District of Columbia and parts of six states: New and Delaware BayDelaware Bay is a large esturarial inlet of the Atlantic Ocean at the mouth of the Delaware River along the coast of the United States. It is bordered by the state of New Jersey on the north, and the state of Delaware in the south. The bay opens into the, on the east coast of the United StatesThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in, and San Francisco BayThe San Francisco Bay is a shallow, productive estuary in which water draining approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean. Technically, the Sacrame, on the Pacific coast, 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 flows into it at all, only a number of small streams.