Bắc Kạn vs Arch

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Bắc Kạn (listen) is the capital of Bắc Kạn Province, Vietnam. The province's only city, it is bordered by Bạch Thông District to the north, north-east and west and Chợ Mới District to the south-east and south-west.The town traces its origins to a fort established in 1880 and upgraded to city on 11 March 2015.

It is divided into six wards: Nguyễn Thị Minh Khai, Đức Xuân, Sông Cầu, Phùng Chí Kiên, Huyền Tụng and Xuất Hóa and 2 communes: Dương Quang, Nông Thượng.

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