• Mesa
  • Yi'an County

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.

Yi'an County is a county of Qiqihar City, Heilongjiang Province, located in 124 °50 °E longitude 125 °42 °E, 47 °16 °M ü 48 °2 °N, at the southern foot of Daxing'an Mountains and the northern edge of Songnen Plain. It is a low hilly wavy plain and is under the jurisdiction of Qiqihar City. As of 2014, Yi'an County has a total area of 3685 square kilometers and cultivated land of 205000 hectares. In 2014, Yi'an County had jurisdiction over 15 townships and 148 administrative villages. Yi'an County has a population of 494000 (2013), with 18% of the non-agricultural population. It is one of the most important commodity grain base counties in the country. Yi'an has rich historical and cultural accumulation, is a characteristic economic county, the main characteristic products are sugar, goose, milk, beans, vegetables, potatoes, porcelain and so on, known as "the hometown of Chinese purple flower oil beans", "Danding"
Airport In Yi'an County - Qiqihar Sanjiazi Airport
Qiqihar Sanjiazi Airport (Qiqihar Sanjiazi Airport, IATA: NDG, ICAO: ZYQQ), located on Damintun Airport Road, Longsha District, Qiqihar City, Heilongjiang Province, China, 10.5 kilometers north of Qiqihar City Center, is a 4C-level military-civilian joint feeder airport, Temporary air ports open to the outside world   .
On May 16, 1988, Qiqihar Sanjiazi Airport officially opened for civil aviation business   ; In June 1993, Qiqihar Sanjiazi Airport became a temporary port airport   ; In 2012, Qiqihar Sanjiazi Airport terminal corridor bridge opened   ; On June 26, 2022, the west runway of Qiqihar Sanjiazi Airport will be opened [twenty three]  .
According to comprehensive news in May 2020, the terminal area of ​​Qiqihar Sanjiazi Airport is 8,000 square meters, including 4,000 square meters for the International Joint Inspection Office.   , two of which are close to the plane; the east runway is 2,600 meters long and 45 meters wide, and the west runway (military) is 3,000 meters long and 50 meters wide; it can meet the annual passenger throughput of 600,000 passengers.     .
In 2021, Qiqihar's three sub-airports will handle a total of 390,683 passengers, a year-on-year increase of 5.4%, ranking 147th in the country; cargo and mail throughput will be 701.8 tons, a year-on-year increase of 85.2%, ranking 135th in the country; aircraft take-offs and landings will be 3,692, A year-on-year decrease of 5.2%, ranking 181st in the country   .
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