• Mesa
  • Gannan 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.

Gannan County belongs to Qiqihar City, Heilongjiang Province, 87 kilometers away from Qiqihar City, located at the southern foot of Daxing'an Mountains, the right bank of the impact plain in the middle reaches of Nenjiang River, longitude 122 °54'6 "east longitude? 24 °28 12", latitude 47 °35 "7"? 8 °32 "5" north. It is bordered by Nuomin River and Nenjiang River to the east, Molidawa Banner in Inner Mongolia Autonomous region, Nehe City in Heilongjiang Province and Fuyu County in Heilongjiang Province to the south, Longjiang County and Meiris Daur Autonomous region in Qiqihar City to the south, and the Jin Dynasty relic "Northeast Road Boundary trench" to the west and north to Buteha Banner and Arong Banner in Inner Mongolia Autonomous region. The county area covers an area of 4792 square kilometers, of which the county belongs to 3560 square kilometers. There are 5 towns, 5 townships and 2 state farms, 95 administrative villages, 611 natural villages and 2.97 million arable land.
Airport In Gannan 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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