Mobara is a city located in Chiba Prefecture. As of 1 December 2020, the city had an estimated population of 88,330 in 40,869 households and a population density of 880 persons per km2. The total area of the city is 99.92 square kilometres (38.58 sq mi)

The Ken-O Expressway , or Metropolitan Inter-City Expressway , is a partially completed ticket system toll expressway in Japan. It is owned and operated by the Central Nippon Expressway Company and East Nippon Expressway Company. In conjunction with the Tokyo Bay Aqua-Line and the Bayshore Route of the Shuto Expressway, the expressway will form a full outer ring road of Tokyo. It is signed as National Route 468 as well as C4 under the "2016 Proposal for Realization of Expressway Numbering."