Tama Hills

Tama Hills
Name	Tama Hills
Native name	多摩丘陵
Settlement type	Hills
Subdivision type	Country
Subdivision name	Japan
Subdivision type1	Region
Subdivision name1	Kantō
Subdivision type2	Prefectures
Subdivision name2	Tokyo, Kanagawa, Saitama

Tama Hills is a low, forested plateau region on the western edge of the Tokyo Metropolis extending into neighboring Kanagawa and Saitama Prefectures. The area forms a transitional zone between the Kantō Plain and the foothills of the Tanzawa Mountains and Chichibu Mountains, and has been shaped by fluvial terraces, volcanic deposits, and long-term human land use. It has served as a site for postwar urbanization projects, suburban housing developments, municipal parks, and mixed agricultural-forestry landscapes.

Geography and Geology

The hills occupy part of the eastern Kantō Plain margin and lie near municipal boundaries of Hachiōji, Machida, Tama City, Kawasaki, Yokohama, Sagamihara, and Fussa. Geologically the region records middle to late Holocene fluvial terraces associated with the Tama River and alluvial fans from tributaries like the Aki River; underlying deposits include volcanic ash from eruptions of Mount Fuji, Mount Hakone, and ancient Izu–Bonin–Mariana Arc activity. Elevations are modest, with rolling ridges and valleys that connect to the Sagami Bay watershed and the Tokyo Bay basin. The soils reflect weathered pyroclastics, reworked loam, and pockets of andisols that support mixed deciduous forest and cultivated plots.

History and Development

Human presence dates from Jōmon-period settlements documented by shell middens and pit-dwelling remains found near Tama River terraces and archaeological sites excavated under municipal programs of Tokyo Metropolitan Government and local museums like the Machida City Museum. In the Heian period and Kamakura period the hills hosted shōen estates linked to temples such as Kōfuku-ji and landholding clans recorded in shōen documents archived in Nara and Kyoto. During the Edo period the area formed part of transportation and supply corridors connecting Edo with western provinces along routes parallel to the Kantō Road networks and riverine transport to Yokohama after the opening of the port. Post-World War II reconstruction prompted large-scale suburbanization under prefectural and national planning led by entities including the Ministry of Construction (Japan) and private developers such as Daiwa House and Sekisui House, transforming former farmland into planned communities and industrial zones linked to corporations like Toyota, Sony, and NEC with nearby manufacturing suburbs.

Ecology and Environment

The biome comprises temperate broadleaf forests dominated by species recorded in surveys by the University of Tokyo, Tokyo Metropolitan University, and the Japan Wildlife Research Center: evergreen broadleaf such as Camellia japonica and deciduous species like Quercus serrata and Zelkova serrata. Fauna inventories note populations of Japanese macaque in higher ridges, small mammals such as Japanese serow in adjacent ranges, avifauna including Japanese bush warbler and Japanese tit, and herpetofauna like the Japanese rat snake. Fragmentation from suburban development has prompted conservation responses by NGOs such as WWF Japan and municipal biodiversity programs under the Ministry of the Environment (Japan), including restoration of satoyama landscapes, wetland preservation in former rice paddies, and invasive species control coordinated with universities and prefectural parks agencies. Air- and water-quality monitoring is conducted by institutions including the National Institute for Environmental Studies to measure impacts from the Keihin Industrial Region and metropolitan emissions.

Urbanization and Housing

From the 1950s through the 1980s, large-scale residential projects created new towns and commuter suburbs served by private railways like Odakyu Electric Railway, Keio Corporation, and JR East lines extending into the area. Planned communities such as the "new town" developments were influenced by models from the United States and United Kingdom postwar suburban planning literature and coordinated with banks like Mitsubishi UFJ Financial Group and developers such as Sumitomo Realty & Development. Housing types range from single-family detached units to mid-rise apartment complexes by builders including Panasonic Homes and Mitsui Fudosan Residential. Municipalities implemented zoning and infrastructure policies under prefectural ordinances and metropolitan planning to manage sprawl, school provision with boards like the Tokyo Metropolitan Board of Education, and public health services delivered through hospitals associated with Tama Medical Center and university-affiliated clinics.

Recreation and Tourism

The hills are a recreational greenbelt for residents of Tokyo and surrounding cities, with attractions managed by municipal park authorities, private botanical gardens, and cultural institutions. Notable trail systems connect to parks such as Tama Zoological Park perimeters, museums including the Tama Art University Museum, and landscaped sites that host seasonal festivals tied to hanami cherry blossom viewing and autumn foliage. Outdoor activities include hiking routes that link to ridgelines offering views of Mount Fuji and the Tanzawa-Ōyama Quasi-National Park, cycling paths integrated with municipal greenways, and agritourism at local orchards that sell Fuji and nashi varieties. Cultural heritage tourism features preserved shrines and temples maintained by municipal cultural property programs and events coordinated with tourism bureaus of Tokyo Metropolitan Government and neighboring prefectures.

Transportation and Infrastructure

A multimodal network serves the hills: commuter rail lines by JR East, Keio Corporation, and Odakyu Electric Railway; bus networks operated by companies like Tama Bus and Keihin Kyuko; arterial roads connecting to expressways such as the Tomei Expressway and Chūō Expressway; and regional cycling infrastructure planned by prefectural transport bureaus. Utility provision is handled by corporations and public bodies including Tokyo Electric Power Company, Tokyo Gas, and regional waterworks managed by Tokyo and Kanagawa prefectural authorities. Flood control in valleys is coordinated with the Tama River Office of the Ministry of Land, Infrastructure, Transport and Tourism through levee works, retention basins, and riverine restoration projects to mitigate typhoon-driven runoff and urban flood risk.

Category:Regions of Tokyo Category:Geography of Kanagawa Prefecture Category:Geography of Saitama Prefecture