| A ria coast is a coastline having several parallel rias separated by prominent ridges, extending a distance inland. |
| However, the definition of ria was later expanded to other flooded river valleys regardless of the structure of the country rock. |
| The river forms a wide, shallow ria at its estuary, Poole Harbour. |
| The estuary is a ria and so is larger than would be the case given the size of the River Exe, the main river feeding into the estuary. |
| In the 21st century, however, the preferred usage of ria by geologists and geomorphologists is to refer solely to drowned unglaciated river valleys. |
| The town of Milford Haven lies on the north bank of the Milford Haven waterway, which is a ria or drowned valley. |
