Chiba Prefecture, located on the eastern edge of the Tokyo metropolitan area, has been identified as the region with the lowest average altitude among the four Kanto prefectures, according to data released by the Geospatial Information Authority of Japan. The average altitude for Chiba is just 45 meters above sea level, making it unique among its neighboring prefectures.
The highest point within Chiba is Mount Atago, reaching only 408 meters. This lack of significant elevation means the prefecture does not contain any mountains over 500 meters, solidifying its position as having the lowest high point of any prefecture in Japan. Following closely is Ibaraki Prefecture with an average altitude of 100 meters, then Tokyo at 242 meters, and Kanagawa at 243 meters.
To put this difference in elevation in perspective, the average altitude of Gunma Prefecture is 764 meters, and Nagano Prefecture boasts the highest average at 1,132 meters. The stark disparity—over 1,000 meters between Chiba and Nagano—emphasizes the flat landscapes found throughout much of Chiba.
Economically, Chiba Prefecture's gross prefectural product reached ¥20.807 trillion as of 2021, reflecting its status as the sixth most populated prefecture with approximately 6.31 million residents as of January 1, 2024. The three largest cities by population are Chiba City, Funabashi City, and Matsudo City, with populations of 978,899, 648,331, and 498,222 respectively.
A recent survey conducted on March 6, 2025, asked participants from around the country to identify which of the Kanto prefectures had the lowest average altitude. The survey engaged 100 respondents aged between 10 and 60, leading to interesting findings. Although over 42% selected Tokyo as the answer, the correct choice was Chiba, with only 17% recognizing it.
Respondents also highlighted the geographic significance of the highest points within each of the four prefectures. For reference, Mount Kumotori stands at 2,017 meters—the highest peak in Tokyo. Meanwhile, Kanagawa's Mount Tanzawa, known for its notable trekking paths, reaches 1,673 meters, and Ibaraki's Mount Yatsubuchi stands at 1,022 meters. With Chiba at the lower end with Mount Atago, the data reflects the geographical characteristics prevalent across the Kanto region.
Culturally and economically, Chiba plays a significant role within the metropolitan area, offering vast flatlands suited for agriculture and urban development. The prefectoral income per capita was also reported at ¥3.059 million for 2021, which is indicative of the region’s economic health. This figure positions Chiba favorably when comparing to the national averages.
Overall, Chiba Prefecture's geographical characteristics contribute to its identity within Japan. The combination of low average elevations, significant population centers, and its economic output warrants interest among residents and outsiders alike.
Chiba continues to develop and adapt as part of Japan’s growing urban centers, and its geographical standing is just one aspect of its complex identity.