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In page Waterford:

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The city of Waterford consists of several cultural quarters, the oldest of which is known as Viking Triangle. This is the part of the city surrounded by the original tenth-century fortifications and is triangular in shape, with its apex at Reginald's Tower. Though once the site of a thriving Viking settlement, the city centre subsequently shifted to the west, and it is now a quieter area with narrow streets, medieval architecture, and civic spaces.[citation needed]