Shibayama is a town located in Chiba Prefecture, Japan. As of 1 December 2020, the town had an estimated population of 7,122 in 3030 households and a population density of 160 persons per km2. The total area of the town is 43.47 square kilometres (16.78 sq mi).

The Shimōsa Plateau is a plateau on the Kantō Plain in central Honshu, Japan. The plateau covers most of northern Chiba Prefecture. The plateau was historically richly agricultural, but in the 20th century the western and central Shimōsa Plateau became one of the major industrial areas of Japan, as well as a large-scale bedroom community of the Tokyo Metropolitan Region. Narita International Airport is located in the center of the Shimōsa Plateau.