A series of winding rivers make their way through the broad central plain of Co. Louth, such as the Glyde and the Dee, and enter the sea at Dundalk Bay.

The River Boyne is the main river that flows through the southern area of Co. Louth. Although the source of the river is at the Bog of Allen in Co. Kildare, it travels over 70 miles to reach the sea at Mornington in Co. Louth. According to the Legend of Nuada-Neacht however, the source of the Boyne lies in a lost well in Co. Meath. It is also famous in Irish mythology from the story of The Salmon of Knowledge, which endowed the young Fionn Mac Cumhall with great knowledge and wisdom.

The Boyne first enters Co. Louth at Townley Hall, close to the famous passage tombs of Newgrange in Co. Meath. Indeed, the Boyne acts as a natural border between the two counties for three miles until it reaches the town of Drogheda. Further along its remaining course it once again acts as the divider between Louth and Meath.

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