Question: In which city, the largest coastal city in northern China, can Helcystogramma perelegans be found?

Context paragraphs:
Mongolian wild ass: The Mongolian wild ass ("Equus hemionus hemionus"), also known as Mongolian khulan, is the nominate subspecies of the onager.  It is found in southern Mongolia and northern China.  It was previously found in eastern Kazakhstan and southern Siberia before being extirpated there through hunting.  In 2015, the Mongolian wild ass are listed as Near Threatened by the IUCN.  Current population estimates are approximately 42,000 individuals in Mongolia and around 5,000 individuals in Northern China.

Sixteen Kingdoms: The Sixteen Kingdoms, less commonly the Sixteen States, was a chaotic period in Chinese history from 304 to 439 when the political order of northern China fractured into a series of short-lived sovereign states, most of which were founded by the "Five Barbarians" who had settled in northern China during the preceding centuries and participated in the overthrow of the Western Jin dynasty in the early 4th century.  The period ended with the unification of northern China by the Northern Wei in the early 5th century.

Tianjin: Tianjin (), formerly known in English as Tientsin, is a metropolis in northern coastal Mainland China and one of the five national central cities of the country, with a total population of 15,469,500, and is also the world's 6th-most populous city proper.  It is governed as one of the four direct-controlled municipalities of the PRC and is thus under direct administration of the central government.  Tianjin borders Hebei Province and Beijing Municipality, bounded to the east by the Bohai Gulf portion of the Yellow Sea.  Part of the Bohai Economic Rim, it is the largest coastal city in northern China.

Helcystogramma perelegans: Helcystogramma perelegans is a moth in the Gelechiidae family.  It was described by N. Omelko and M. Omelko in 1993.  It is found in south-eastern Siberia, Korea, Japan and China (Hunan, Tianjin).

Salinas, Ecuador: Salinas is a coastal city located in the Province of Santa Elena, Ecuador.  It is the seat of the canton that bears its name.  The westernmost city on mainland Ecuador, Salinas is an important tourist center.  Salinas, Ecuador's largest coastal resort, offers one of the country's best real estate investment markets and most popular and most upscale beach lifestyle.  Recently, Salinas was the center of controversy during the contentious "more fun, less sun," debate.  It is the site of the ISA World Junior Surfing Games Ecuador in 2009.  There are two major yacht clubs in Salinas, the first is Salinas Yacht Club, which is a good bit smaller than the Puerto Lucia Yacht Club, in Santa Elena, in an area known as 'La Libertad' which, in Spanish means; 'The Freedom Town'.  Puerto Lucia boasts a hotel, several restaurants to eat, a private beach and apartment block buildings, as well as the large marina and port.

Chilika Lake: Chilika lake is a brackish water lagoon, spread over the Puri, Khurda and Ganjam districts of Odisha state on the east coast of India, at the mouth of the Daya River, flowing into the Bay of Bengal, covering an area of over 1,100 km.  It is the largest coastal lagoon in India and the second largest coastal lagoon in the world after The New Caledonian barrier reef in New Caledonia.

Carex sect. Macrocephalae: Carex" sect.  "Macrocephalae is a section of the genus "Carex", containing two species.  Both are coastal species of sandy areas beside the northern Pacific Ocean – "Carex kobomugi" from Taiwan to northern China and Japan (and as an invasive species in the north-eastern United States), and "Carex macrocephala" from northern China to Oregon.

Wadi-e-Hussain: Wadi-e-Hussain (Urdu: وادئ حسین‎ , "The Valley of Hussain") is the largest organized and the first online cemetery in Pakistan, located in the northern part of the coastal city of Karachi on Karachi–Hyderabad Motorway; it is connected to the city by the main highway connecting Karachi with Hyderabad.  The cemetery has been an inspiration for the local people in the coastal city.  Apart from elders, there is a specific column/place for the children who die in their early ages.  However, the cemetery has been a common burial cite for the local Shiite Muslims.  The graveyard is also decorated with the special lights on special occasions such as Eid al-Fitr, Eid al-Adha, Mid-Sha'ban etc.

Helcystogramma fernaldella: Helcystogramma fernaldella, or Fernald's helcystogramma moth, is a moth in the Gelechiidae family.  It was described by August Busck in 1903.  It is found in North America, where it has been recorded from Alaska, Yukon and Alberta, east across Canada and the northern United States to New Brunswick and New England.  The habitat consists of fields, meadows and grasslands.

Yancheng Coastal Wetlands: The Yancheng Coastal Wetlands is the largest coastal wetlands nature reserve in China.  It is situated close to Yancheng, Jiangsu province, China.

Supporting paragraphs: Helcystogramma perelegans Tianjin
Answer: Tianjin