Mianyang (; formerly known as Mienchow) is the second largest prefecture-level city of Sichuan province in Southwest China. Located in north-central Sichuan covering an area of consisting of Jiangyou, a county-level city, five counties, and three urban districts. Its total population was 4,868,243 people at the 2020 Chinese census, of whom 2,232,865 live in its built-up (or metro) area made of three urban districts. History Mianyang, which was known as Fuxian (Fu County) in ancient times, had advanced in agriculture during the Qin (221−206 BCE) and Han (206 BCE−220 CE) dynasties. It has a history of over 2,200 years since the Emperor Gaozu of Han established the first county in this area in 201 BCE. Due to its advantageous location, it had always been a town of great military importance and formed a natural defence for Chengdu. Mianyang is home to the CAEP and Science City, an immense Military Research Complex which was the site of the development of China's first nuclear bomb. The city proper itself was only lightly damaged by the earthquake of 12 May 2008. However, Beichuan County, which is in the prefecture, was among the most severely hit of all disaster regions following the earthquake, including the Beichuan High School campus where more than 1,000 students lost their lives after two main buildings collapsed. Around 80% of the county's buildings are said to have collapsed, including its main government building. The casualty toll for the quake in Mianyang Prefecture as of 7 June 2008, was 21,963 people killed, 167,742 injured, and 8,744 people missing. Geography and climate Mianyang is at the northwestern end of the Sichuan Basin, on the upper to middle reaches of the Fu River. Its administrative area ranges in latitude from 30° 42' to 33° 03' N and in longitude from 103° 45' to 105° 43' E. Bordering prefectures are Guangyuan to the northeast, Nanchong to the east, Suining to the south, Deyang to the southwest, and the Ngawa Tibetan and Qiang Autonomous Prefecture to the west. It also borders Gansu for a small section in the north. Mianyang has a monsoon-influenced humid subtropical climate (Köppen Cwa) and is largely mild and humid, with four distinct seasons. Winter is short, mild, and foggy, though precipitation is low. January averages , and while frost may occur, snow is rare. Summers are long, hot, and humid, with highs often exceeding . The daily average in