Arch vs Téra

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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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Téra is a city in the Tillabéri Region, Tera Department of Niger. It is situated 175 km north-west of the capital Niamey, close to the border with Burkina Faso.

It is mainly inhabited by Songhai, Fulani, Gourmantche and Buzu ethnic groups. The majority of the population are farmers.

Source: Wikipedia