Question: Which country contains County-level cities by the names of Wu'an and Langzhong?

Context paragraphs:
Eastern Wu: Wu (222–280), commonly known as Eastern Wu or Sun Wu, was one of the three major states that competed for supremacy over China in the Three Kingdoms period (220–280).  It previously existed from 220–222 as a vassal kingdom nominally under Cao Wei, its rival state, but declared independence from Wei and became a sovereign state in 222.  It became an empire in 229 after its founding ruler, Sun Quan, declared himself 'Emperor'.  Its name was derived from the place it was based in — the Jiangnan (Yangtze River Delta) region, which was also historically known as "Wu".  It was referred to as "Eastern Wu" or "Sun Wu" by historians to distinguish it from other Chinese historical states with similar names which were also located in that region, such as the Wu state in the Spring and Autumn period and the Wuyue kingdom in the Five Dynasties and Ten Kingdoms period.  It was called "Eastern Wu" because it occupied most of eastern China in the Three Kingdoms period, and "Sun Wu" because the family name of its rulers was "Sun".  During its existence, Wu's capital was at Jianye (present-day Nanjing, Jiangsu), but at times it was also at Wuchang (武昌 ; present-day Ezhou, Hubei).

List of township-level divisions of Guizhou: This is a list of township-level divisions of the province of Guizhou, People's Republic of China.  After province, prefecture, and county-level divisions, township-level divisions constitute the formal fourth-level administrative divisions of the PRC.  This list is divided first into the prefecture-level then the county-level divisions.  The six prefecture-level divisions of Guizhou are subdivided into 107 county-level divisions (15 districts, 7 county-level cities, 54 counties, 11 autonomous counties and 1 special district ).  Those are in turn divided into 1785 township-level divisions (691 towns 镇, 506 townships 乡, 252 ethnic townships and 94 subdistrcts).

List of cities in China: According to the administrative divisions of China including Hong Kong and Macau, there are three level of cities, namely provincial-level (consists of municipalities and SARs), prefectural-level cities, and county-level cities.  As of September 2017 the PRC has a total of 662 cities: 4 municipalities, 2 SARs, 293 prefectural-level cities (including the 15 sub-provincial cities) and 363 county-level cities (including the 9 sub-prefectural cities and 9 XXPC cities) not including any cities in the claimed province of Taiwan.

Hangzhou dialect: Hangzhou dialect (; "Rhangzei Rhwa"), is spoken in the city of Hangzhou and its immediate suburbs, but excluding areas further away from Hangzhou such as Xiāoshān (蕭山) and Yúháng (余杭) (both originally county-level cities and now the districts within Hangzhou City).  The number of speakers of the Hangzhou dialect has been estimated to be about 1.2 to 1.5 million.  It is a dialect of Wu, one of the Chinese varieties.  The Hangzhou dialect is of immense interest to Chinese historical phonologists and dialectologists because phonologically, it exhibits extensive similarities with the other Wu dialects; however, grammatically and lexically, it shows many Mandarin tendencies.

Counties of the People's Republic of China: Counties ( ), formally county-level divisions, are found in the third level of the administrative hierarchy in Provinces and Autonomous regions, and the second level in municipalities and Hainan, a level that is known as "county level" and also contains autonomous counties, county-level cities, banners, autonomous banner, and City districts.  There are 1,464 counties in Mainland China out of a total of 2,862 county-level divisions.

Taishanese people: Sze Yap Cantonese (Chinese: 四邑廣東人; Sze Yap: Hlei Yip Gong Ong Ngin; Cantonese: Sei Yap Gwong Dong Yan; Mandarin: Sìyì guǎngdōng rén) are a Han Chinese group coming from a region in Guangdong Province in China called Sze Yap (四邑), which consisted of the four county-level cities of Taishan, Kaiping, Xinhui, and Enping.  Now Heshan has been added to this historic region, and the prefecture-level city of Jiangmen administers all five of these county-level cities, which is sometimes informally called Ng Yap.  Their ancestors are said to have arrived from what is today central China about less than a thousand years ago and migrated into Guangdong around the Tang Dynasty rule period, and thus Taishanese as a dialect of Yue Chinese has linguistically preserved many characteristics of Middle Chinese.

Wu'an: Wu'an () is a County-level city in the prefecture level city of Handan, Hebei province, China.

County-level city: A county-level municipality (), county-level city, or county city is a county-level administrative division of mainland China.  County-level cities are usually governed by prefecture-level divisions, but a few are governed directly by province-level divisions.  Formerly known as prefecture-controlled city (1949-1970: ; 1970-1983: ).

List of county-level divisions of China: County-level divisions are the third level of administration of the People's Republic of China and include counties, autonomous counties, banners, autonomous banners, county-level cities and districts.  Most county-level divisions are administered as part of prefecture-level divisions, but some are administered directly by province-level divisions.

Langzhong: Langzhong is a county-level city in northeastern Sichuan, China, located on the middle reaches of the Jialing River.  It is administered as part of the prefecture-level city of Nanchong.  Langzhong has a total population of 840,000, with 200,000 residing in the urban area.

Supporting paragraphs: Wu'an Langzhong
Answer: China