• Mesa
  • Tong'an District

A mesa is an isolated, flat-topped elevation, ridge or hill, which is bounded from all sides by steep escarpments and stands distinctly above a surrounding plain. Mesas characteristically consist of flat-lying soft sedimentary rocks capped by a more resistant layer or layers of harder rock, e.g. shales overlain by sandstones. The resistant layer acts as a caprock that forms the flat summit of a mesa. The caprock can consist of either sedimentary rocks such as sandstone and limestone; dissected lava flows; or a deeply eroded duricrust. Unlike plateau, whose usage does not imply horizontal layers of bedrock, e.g. Tibetan Plateau, the term mesa applies exclusively to the landforms built of flat-lying strata. Instead, flat-topped plateaus are specifically known as tablelands.

Tongan District (ancient Tongan County, Quanzhou Prefecture) is one of the six districts of Xiamen, also known as "Silver City". It was bought in the third year of Taikang in the Western Jin Dynasty (AD 282) and soon abandoned. Tang Zhenyuan nineteen years (803) analysis of Nanan County Datong Field, Tang Changxing four years after the five dynasties (933). Tianfu four years after the Jin Dynasty (939), the same field as Tongan County, is the capital of Quanzhou. In 1958, Tongan County was divided into Xiamen City, Tongan County was divided into Jinjiang area in June 1970, and Xiamen City in June 1973. The implementation of county governance, because the county seat is in the shape of a waist silver ingot, it is called "Silver City". In history, it had jurisdiction over Jinmen, Xiamen, Jimei District and a small part of the eastern part of Zhangzhou Taiwan Investment Zone. After liberation, the administrative area was changed several times and was assigned to it in 1973.
Airport In Tong'an District - Xiamen Gaoqi International Airport
Xiamen Gaoqi International Airport (Xiamen Gaoqi International Airport, IATA: XMN, ICAO: ZSAM), located in Huli District, Xiamen City, Fujian Province, China, is a 4E-class civil international airport and an important regional aviation hub on the southeast coast of China. One of the two major trunk airports.  
Xiamen Gaoqi International Airport was opened to traffic in 1983. In November 1996, Terminal 3 of the airport was put into use. In December 2014, Terminal 4 was officially opened, and the annual passenger handling capacity of the airport rose to 27 million.   
According to information on the airport's official website in September 2017, Xiamen Gaoqi International Airport has a 3,400-meter-long runway, 2 parallel taxiways and 10 contact roads; the total area of ​​the apron is 770,000 square meters, with 89 parking spaces; the terminal building The total construction area is 237,800 square meters; a total of 109 cities and 182 domestic and overseas routes have been opened.  
In 2016, Xiamen Gaoqi International Airport completed a passenger throughput of 22.7376 million passengers, a year-on-year increase of 4.2%; cargo and mail throughput of 328,400 tons, a year-on-year increase of 5.7%; take-off and landing sorties of 183,500 vehicles, a year-on-year increase of 1.9%, ranking first in China respectively. 11, 12, 13.  
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