Sanbu District
![Location of Sanbu District in Chiba Prefecture](/Images/godic/202502/09/Sanbu_District_in_Chiba_Prefecture.svg1808.png")
Sanbu District(山武郡Sanbu-gun) is a district located in Chiba Prefecture, Japan. As of January 2013, the district had a population of 49,488 and a population density of 369 persons per km². The total area is 134.1 square kilometres (51.8 sq mi).