Shimōsa Plateau
| Shimōsa Plateau (下総台地 Shimōsa-daichi) | |
| Plateau | |
 |
|
| Country | Japan |
|---|---|
| State | Chiba Prefecture |
| Region | Kantō Region |
| Borders on | Tone River-N Kujūkuri Beach and Pacific Ocean-E Bōsō Hill Range-S Edo River-W |
| Parts | Kantō Plain |
| Landmark | Narita International Airport |
| Lake | Lake Inbanuma Lake Teganuma |
| River | Tone River Edo River Kuriyama River Kida River |
| Coordinates | 35°45′45″N 140°23′08″E / 35.76250°N 140.38556°ECoordinates: 35°45′45″N 140°23′08″E / 35.76250°N 140.38556°E |
| Highest point | 10 |
| - coordinates | 35°53′09″N 109°14′56″W / 35.88583°N 109.24889°W |
| Lowest point | 150 |
The Shimōsa Plateau (下総台地 Shimōsa-daichi?) 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.
The Shimōsa Plateau covers most of northern Chiba Prefecture. The plateau ranges between 10 metres (33 ft) and 150 metres (490 ft) above sea level. While the Shimōsa Plateau has no set boundaries, it ranges roughly south to north from the Bōsō Hill Range to the lowlands of the Tone River, and east from the Edo River west to the lowlands of Kujūkuri Beach. The plateau runs from Funabashi to Katori.
Shimōsa Plateau sits above the Shimōsa Group (下総層群 Shimōsa-sōgun?), a geological group under the Bōsō Peninsula. The Shimōsa Group dates from the Tertiary and periods, and is roughly divided into the Jizodo, Yabu, and Narita formations. The geological group consists primarily of sedimentary layers of loose sand, and secondarily of clay silt and pebbly-sand layers. Above the Shimōsa Group are more recent rich, fertile layers of volcanic ash. The Shimōsa Plateau yields great deposits of fossils, notably molluscan fossils, as the plateau was originally submerged under water.
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