Question: What country does Yushu City, Qinghai and Zunhua have in common?

Context articles: Yushu Batang Airport
The Mercado Campesino
Gyêgu
Zunhua
Halcyon Park, Bloomfield, New Jersey
Triplophysa hialmari
Zarma language
Cottage country
Yushu City, Qinghai
Prostitution in Laos

The Yushu Batang Airport () (IATA: YUS, ICAO: ZLYS) is the airport serving Yushu City in Qinghai Province, China.
 It is located 18 kilometers to the south of the city center, Gyêgu, at the 3,890 meters elevation about the sea level, which makes it the highest civilian airport in Qinghai Province, and one of the highest in the world.
The Mercado Campesino is the largest market place in Sucre, Bolivia.
 It has been operating for 26 years and continues to expand with the popularity of market culture in Bolivia.
 The name of the market, in Spanish, literally means 'market of the people from the countryside'.
 This is because many of the products are grown or manufactured outside of the city.
 The market is also the most common place for country or indigenous people to conduct their business in Sucre.
 With a population of 300,000, approximately 20 000 people from Sucre work in association with the Marcardo Campicino each day.
 The majority of the market operates out of lightly constructed, semi mobile and mobile stalls that sit directly on the street.
 Some vendors operate out of backpacks and suitcases.
 Despite being outside the central area of town, the Marcardo Campacino is visited more than any other location in Sucre.
 Market traffic varies during the week.
 Saturdays are the most popular.
 On the weekend it is common for family members to visit the market together as a form of leisure.
Gyêgu is a town in Yushu City, Yushu Tibetan Autonomous Prefecture, Qinghai, China.
 Gyêgu is the modern town which developed from the old Tibetan trade mart called Jyekundo or Gyêgudo in Tibetan and most Western sources.
 The town is also referred to as Yushu, synonymous with the prefecture of Yushu and the city of Yushu.
Zunhua () is a county-level city under the administration of Tangshan, Hebei, China.
 Historic sites include the Eastern Qing Tombs (Qing Dongling).
Halcyon Park is an unincorporated community that was developed by Reverend Cyrus Kemper Capron in Bloomfield, in Essex County, New Jersey, United States, in 1895 as a planned community of homes with trees and shrubs, picturesque cottages, ponds and common grounds to be maintained by a caretaker and gardener.
 It is believed that Halcyon Park was inspired by Llewellyn Park, the first planned garden suburb about three miles away.
 Capron envisioned a private residential park for individuals of moderate means to offer all the advantages of the city (proximity to two railroads and a trolley for access to Newark and New York City, water, gas sewer and paved streets) and the country (trees, ponds, picturesque landscape).
 The original plan laid out 182 lots and common grounds to include a club house and tennis courts for common use by a lot-owners association.
 The Club House contained a bowling alley, billiard table, library and stage.
 The common grounds included a gate house, a conservatory, and two ponds.
 The land was developed with water, sewer and gas lines and paved streets, innovative at the time.
Triplophysa hialmari is a species of stone loach endemic to China.
 Its type locality is "Ba-tshu River", a tributary of the Yangtze River near Yushu City, Qinghai.
Zarma (also spelled Djerma, Dyabarma, Dyarma, Dyerma, Adzerma, Zabarma, Zarbarma, Zarma, Zarmaci or Zerma) is one of the Songhay languages.
 It is the leading indigenous language of the southwestern lobe of the West African nation of Niger, where the Niger River flows and the capital city, Niamey, is located.
 Zarma is second-most common language in the country, after Hausa, which is spoken in south-central Niger.
 With over 2 million speakers, Zarma is easily the most widely common Songhay language.
Cottage country is a common name in the Canadian province of Ontario, as well as other regions of the country, for areas that are popular locations for recreational properties such as cottages and summer homes. Cottage country is often socially, culturally, economically, and politically distinct from other rural areas in that it is populated by a notably higher concentration of urban vacationers and residents who have an affinity for the outdoors in contrast to more traditional rural populations that are largely absent of "city folk" (although, this distinction tends to be more noticeable in the East than the West).
 Any major population centre may have its own popular "cottage country" area.
 The name is sometimes applied locally in vernacular use.
 For example, Toronto, Ontario residents might say "I am heading up to cottage country this weekend," which is locally understood to be referring to Muskoka, the Kawarthas, or the Haliburton area.
 On the other hand, a speaker from Ottawa would use the same phrase to denote the Rideau Lakes area.
Yushu is a county-level city of Yushu Tibetan Autonomous Prefecture in southern Qinghai province, China.
 It comprises a surface area of 13462 km² .
 In 2010, the overall city's population was 120,447 and 56,802 live within the city core.
 Yushu is the fourth largest city in Qinghai.
Prostitution in Laos is regarded as a criminal activity and is much less common than it is in neighbouring Thailand.
 The capital city Vientiane was once famous for its brothels and "ping pong show" bars during the 1960s and 1970s as a result of the country's involvement in the Vietnam War.
 However, the brothels have since disappeared and are now prohibited by Lao law.
 Soliciting for prostitution instead takes place mainly in the city's bars and clubs, although street prostitution also takes place.
 The visibility of prostitution in Laos belies the practice's illegalily.
 The country's "Golden Triangle Special Economic Zone" in Bokeo Province has been called "a mecca of gambling, prostitution and illicit trade".
 Most prostitutes in Laos are from poor rural Laotian families and the country's ethnic minorities.
 In addition to these, there are many prostitutes in Laos from China and Vietnam, while some Laotian women go to Thailand to work as sex workers.
 Laos has been identified as a source country for women and girls trafficked for commercial sexual exploitation in Thailand.