Arch vs Madolenihmw

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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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Madolenihmw is one of the administrative divisions of the Micronesian island of Pohnpei. It is located in the central east of the island, to the east of Mount Nahna Laud and south of Mount Kapwuriso.

The coast of Madolenihmw includes a large bay which contains the island of Temwen, famous for its Nan Madol ruins.

Source: Wikipedia