Arch vs Cagayan De Oro

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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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Cagayan de Oro, officially the City of Cagayan de Oro (Cebuano: Dakbayan sa Cagayan de Oro; Tagalog: Lungsod ng Cagayan de Oro), or simply referred to as CDO, is a 1st class highly urbanized city in Northern Mindanao, Philippines. It is the capital of the province of Misamis Oriental where it is geographically situated but governed administratively independent from it. According to the 2015 census, it has a population of 675,950 people. It also serves as the regional center and business hub of Northern Mindanao (Region X), and part of the growing Metropolitan Cagayan de Oro area, which includes the city of El Salvador, the towns of Opol, Alubijid, Laguindingan, Gitagum at the western side, and the towns of Tagoloan, Villanueva, Jasaan, Claveria at the eastern side.

The City of Cagayan de Oro is located along the north central coast of Mindanao island facing Macajalar Bay and is bordered by the municipalities of Opol to the west, Tagoloan to the east, and the provinces of Bukidnon and Lanao del Norte to the south of the city. According to the 2015 census, the city has a population of 675,950, making it the 10th most populous city in the Philippines. Cagayan de Oro is also famous for its white water rafting or kayaking adventures, one of the tourism activities being promoted along the Cagayan de Oro River.

Source: Wikipedia