| | Firth - All About All (Site not responding. Last check: 2007-11-07) |
 | | A firth is generally the result of glaciation and very often associated with a large river, where erosion caused by the tidal effects of incoming sea water passing upriver has widened the riverbed to an estuary, such as may be seen in the Firth of Clyde. |
 | | The Firth of Inverness is rarely identified on modern maps, but it is this firth which forms a connection via the River Ness, Loch Ness and the other lochs of the Great Glen and stretches of the Caledonian Canal with the Firth of Lorn on the West coast of Scotland. |
 | | The Firth of Thames is a bay at the mouth of the Waihou/Thames River in New Zealand. |
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