Abas/Ales vs Arch

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Ales (Sardinian pronunciation: Abas), is a small village in Oristano, on the island Sardinia in Italy's Mediterranean Sea. It is located on Mount Arci's eastern slopes. This is the only source of obsidian in Sardinia. Ales, together with Terralba form the Roman Catholic Diocese of Ales–Terralba.

Giovanni Dettori is the current bishop. The bishops' seat is located in Ales Cathedral, which is dedicated to Saint Peter. Ales was the birthplace of Fernando Atzori and Antonio Gramsci. Cagliari is the closest international airport, approximately 70 km (43 mi).

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