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River, Ireland. The country's longest river, it rises in northwestern County Cavan and flows for about 230 mi (370 km) to enter the Atlantic Ocean below Limerick. It is surrounded by marshes and bogs for much of its course and widens at various points into lakes, many with islands. In the early 19th century it was a vital link in the waterways of Ireland; today it is used by pleasure craft.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Shannon, River, visit Britannica.com.
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