Villages, formally village-level divisions in China, serve as a fundamental organizational unit for its rural population. Basic local divisions like neighborhoods and communities are not informal, but have defined boundaries and designated heads. In 2000, China's densely populated villages had a population greater than 500 million and covered more than 2 million square kilometers, or more than 20% of China's total area. By 2020, all incorporated villages had road access, the last village to be connected being a remote village in Sichuan province's Butuo County.