Limerick vs Arch

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Limerick (; Irish: Luimneach [ˈl̪ˠɪmʲ(ə)nʲəx]) is a city in County Limerick, Ireland. It is located in the Mid-West Region and is also part of the province of Munster. With a population of 94,192 at the 2016 census, Limerick is the third-most populous urban area in the state, and the fourth-most populous city on the island of Ireland at the 2011 census.

The city lies on the River Shannon, with the historic core of the city located on King's Island, which is bounded by the Shannon and Abbey Rivers. Limerick is also located at the head of the Shannon Estuary, where the river widens before it flows into the Atlantic Ocean. Limerick City and County Council is the local authority for the city.

Source: Wikipedia

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An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it. Arches may be synonymous with vaults, but a vault may be distinguished as a continuous arch forming a roof.

Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture, and their systematic use started with the ancient Romans, who were the first to apply the technique to a wide range of structures.

Source: Wikipedia