The Kansas City metropolitan area is a bi-state metropolitan area anchored by Kansas City, Missouri. Its 14 counties straddle the border between the U.S. states of Missouri (9 counties) and Kansas (5 counties). With 8,472 square miles (21,940 km2) and a population of more than 2.2 million people, it is the second-largest metropolitan area centered in Missouri (after Greater St. Louis) and is the largest metropolitan area in Kansas, though Wichita is the largest metropolitan area centered in Kansas. Alongside Kansas City, Missouri, these are the suburbs with populations above 100,000: Overland Park, Kansas; Kansas City, Kansas; Olathe, Kansas; Independence, Missouri; and Lee's Summit, Missouri.
Lu County is the lower jurisdiction county of Luzhou City, Sichuan Province, which is located in the south of Sichuan Basin, between longitude 105 °10 °50 "~ 105 °45 °30" east longitude and latitude 28 °54 °40 "~ 29 °20 °00" north. Lu County is bordered by Yongchuan District of Chongqing City and Hejiang County of Luzhou City in the east, Longmatan District and Jiangyang District of Luzhou City in the south, Fushun County of Zigong City in the west, and Rongchang District of Chongqing City and Longchang City of Neijiang City in the north. Lu County is a major national cultural relic county, with 6 key cultural relics protection units such as Longnaoqiao and Song Tombs in Luxian County. It is a national construction and labor base county, a national model county with double support, a national health city, and one of the top 100 counties in the western region. On February 2, 2019, it was rated as a county-level national advanced unit of traditional Chinese medicine by the State Administration of traditional Chinese Medicine.