Arch vs Oran

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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

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Oran ( o-r-an; Arabic: وَهران‎, romanized: Wahrān also UK: , US: , French: [ɔʁɑ̃]) is a major coastal city located in the north-west of Algeria. It is considered the second most important city of Algeria after the capital Algiers, due to its population, commercial, industrial, and cultural importance. It is 432 km (268 mi) from Algiers.

The total population of the city was 759,645 in 2008, while the metropolitan area has a population of approximately 1,500,000 making it the second largest city in Algeria.A legend says that in 900 CE, lions still lived in the area. The last two lions were hunted on a mountain near Oran and are elsewhere referred to as "mountain lions".

Source: Wikipedia