Are Yan'an and Weihui both in China?
yes
Yan'an
Yan'an (, ; is a prefecture-level city in the Shanbei region of Shaanxi province, China, bordering Shanxi to the east and Gansu to the west.
 It administers several counties, including Zhidan (formerly Bao'an), which served as the headquarters of the Chinese Communists before the city of Yan'an proper took that role.
Weihui
Weihui (), formerly Jixian or Ji County (), is a county-level city in Henan, China.
 It is under the administration of the prefecture-level city of Xinxiang.
 The city has an area of 882 km² and a population of 480,000.
Temple of Yan Hui
The Temple of Yan Hui, commonly known as simply the Temple of Yan or Yan Temple (), is a temple in Qufu, China, dedicated to Yan Hui (521-490 BC), the favorite disciple of Confucius. Yan (surname)
Yan is a Chinese surname, it is the pinyin romanization for several Chinese characters such as "严 (嚴 )", "晏 (晏 )", "偃 (偃 )", "颜 (顏 )", "言 (言 )", "燕 (燕 )", "阎 (閻 )", "闫 (閆 )", "鄢 (鄢 )" in simplified (traditional) form.
 Note that these characters are spelled as Yen in the Wade–Giles romanization system which was the prevalent one before the early 80s.
 From such, individuals and institutions who have had to romanize their Chinese names prior to that time, such as when having their books translated or publishing manuscripts outside of China, used "Yen" instead of "Yan".
 Such examples include Yenching University and the Harvard-Yenching Institute.
 The Yan surname in Taiwan is mostly spelled as Yen since only until recently has the government approved the use of pinyin romanization of names.
 The Cantonese romanization of these surnames is "Yim".
 As such, most people from Hong Kong and Chinese diaspora that emigrated prior to 1949 from Guangdong use the name Yim.
 On many occasions, "甄 (甄 )" in Cantonese is also romanized as Yan. Yan'an Forum
The Yan'an Forum on Literature and Art () was a May 1942 forum held at the city of Yan'an in Communist-controlled China and significant event in the Yan'an Rectification Movement.
 It is most notable for the speeches given by Mao Zedong, later edited and published as "Talks at the Yan'an Forum on Literature and Art" () which dealt with the role of literature and art in the country.
 The two main points were that (1) all art should reflect the life of the working class and consider them as an audience, and (2) that art should serve politics, and specifically the advancement of socialism.
 The excesses of the latter point during the Cultural Revolution led to current Party policy rejecting that point, but retaining Mao's encouragement of peasant-focused art and literature. Roman Catholic Diocese of Weihui
The Roman Catholic Diocese of Weihui/Weíhwei/Jixian (Latin: "Ueihoeiven(sis)" , ) is a diocese located in the city of Weihui in the Ecclesiastical province of Kaifeng in China. Yan'an Elevated Road
Yan'an Elevated Road () is an elevated expressway in the city of Shanghai, China.
 It runs along Yan'an Road in its entirety, continuing from the east terminus of G50 Shanghai-Chongqing Expressway at Huqingping Interchange (close to Hongqiao International Airport) to just beyond the Shanghai Natural History Museum, at which point it ends and rejoins Yan'an Road on the surface.
 Traffic is then partly directed underground to the Bund Tunnel (completed 2010).
 Motorists continuing east can cross the Huangpu River using the East Yan'an Road Tunnel to Pudong. Battle of Canhe Slope
Battle of Canhe Slope (參合陂之戰) refers to a battle in 395 where the Chinese/Xianbei state Later Yan, then ruling over northern and central China, had launched a punitive campaign against its former vassal Northern Wei, also of Xianbei extraction.
 Later Yan forces were led by its crown prince Murong Bao and enjoyed some initial successes, but after being frustrated by the containment strategy by Northern Wei's prince Tuoba Gui (the later Emperor Daowu), withdrew.
 Tuoba Gui then gave chase and crushed Later Yan forces at Canhe Slope.
 He captured a large number of Later Yan forces as captive, but in fear that releasing them would allow a future Later Yan campaign against Northern Wei, slaughtered them.
 The battle reversed the power relations between Later Yan and Northern Wei.
 After Later Yan's emperor Murong Chui (Emperor Wucheng) died in 396 and Murong Bao succeeded to the throne (as Emperor Huimin), Northern Wei would launch a debilitating campaign of conquest against Later Yan, and by 398 had captured most of Later Yan's territory, reducing Later Yan to a small regional state. Western Yan
The Western Yan (; 384-394) was a state of Xianbei ethnicity during the era of Sixteen Kingdoms in China.
 It was founded by Murong Hong in 384 in the aftermaths of Former Qin's defeat by Jin Dynasty (265-420) at the Battle of Fei River, with the stated intent of permitting the Xianbei, whom Former Qin's emperor Fu Jiān had relocated to Former Qin's capital region after destroying Former Yan in 370.
 It initially also was intended to rescue the last Former Yan emperor Murong Wei, until he was executed by Fu Jiān in 385.
 It was a state that was characterized by extreme political instability and internal fighting, as all seven of its rulers (during a short span of 10 years) died of unnatural causes.
 After eviscerating Former Qin, the people of the state abandoned the Guanzhong region and headed east back toward their homeland, but eventually settled down in modern Shanxi.
 It was destroyed in 394 as Later Yan's emperor Murong Chui wanted to reunite the people formerly of Yan and conquered it. Yue Yi
Yue Yi (), enfeoffed as Lord of Changguo (), was a prominent military leader of the State of Yan during the Warring States period of ancient China.
 He was the son of the prime minister of the state of Zhongshan, but when Zhongshan was destroyed by King Wuling of Zhao, he was forced to wander from country to country.
 His talents were recognized by King Zhao of Yan, and he was made a minister.
 He served with great skill and helped forge alliances with the states of Zhao, Wei, Chu, Han and Qin against the threat posed by Qi.
 He led the allied armies and crushed the Qi forces.
 The cruel King of Qi was driven away, and, except for two cities, the entire territory of Qi was brought under control.
 Soon thereafter, King Zhao of Yan suddenly died.
 Due to the scheming of Tian Dan of Qi, King Hui of Yan mistrusted him and he fled to the state of Zhao, where he was enfeoffed as Lord of Wangzhu ().
 His son Yue Jian (樂間) inherited his title Lord of Changguo in Yan.