Tolanaro vs Arch

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Tôlanaro or Tolagnaro (Malagasy: Tôlan̈aro [tolaˈŋarʷ]) is a city (commune urbaine) on the southeast coast of Madagascar. It is the capital of the Anosy Region and of the Tôlanaro District. It has been a port of local importance since the early 1500s, and a new port, the Ehoala Port, has been built by QMM and the World Bank.

Formerly Fort-Dauphin, it was the first French settlement in Madagascar.

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