Bōsō Peninsula
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The is a
peninsula A peninsula (; ) is a landform that extends from a mainland and is surrounded by water on most, but not all of its borders. A peninsula is also sometimes defined as a piece of land bordered by water on three of its sides. Peninsulas exist on all ...
that encompasses the entirety of
Chiba Prefecture is a prefecture of Japan located in the Kantō region of Honshu. Chiba Prefecture has a population of 6,278,060 (1 June 2019) and has a geographic area of . Chiba Prefecture borders Ibaraki Prefecture to the north, Saitama Prefecture to the ...
on
Honshu , historically called , is the largest and most populous island of Japan. It is located south of Hokkaidō across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyūshū across the Kanmon Straits. The island separ ...
, the largest island of
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
. It is part of the
Greater Tokyo Area The Greater Tokyo Area is the most populous metropolitan area in the world, consisting of the Kantō region of Japan (including Tokyo Metropolis and the prefectures of Chiba, Gunma, Ibaraki, Kanagawa, Saitama, and Tochigi) as well as the ...
. It forms the eastern edge of
Tokyo Bay is a bay located in the southern Kantō region of Japan, and spans the coasts of Tokyo, Kanagawa Prefecture, and Chiba Prefecture. Tokyo Bay is connected to the Pacific Ocean by the Uraga Channel. The Tokyo Bay region is both the most populous a ...
, separating it from the
Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...
. The peninsula covers approximately .


Description

The Bōsō Peninsula is defined by the Pacific Ocean to its east and south, Tokyo Bay to the west, and the Edo and Tone rivers to the north. The
Bōsō Hill Range The is a mountain range on the Bōsō Peninsula of Chiba Prefecture, Japan. The highest point in the Bōsō Mountain Range is at Mount Atago, with an altitude of . The hill range runs from roughly in a line from Mobara or Ōamishirasato to Kisa ...
forms the backbone of the south of the peninsula, and much of the area is hilly.
Mount Atago ''Mount Atago is a very common name for peaks all over Japan.'' is a 924m mountain in the northwestern part of Ukyo-ku, in the city of Kyoto, Kyoto Prefecture, Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an islan ...
in
Minamibōsō is a city located in Chiba Prefecture, Japan. , the city had an estimated population of 37,143 in 17,175 households and a population density of 160 persons per km². The total area of the city is , making it the fifth largest city in Chiba Pr ...
and Kamogawa is the highest point on the peninsula with an altitude of . From south to north the Bōsō Hill Range gives way to the
Shimōsa Plateau The 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 ...
, which covers much of the area of northern Chiba Prefecture, and ends in the lower areas around the
Tone River The is a river in the Kantō region of Japan. It is in length (the second longest in Japan after the Shinano) and has a drainage area of (the largest in Japan). It is nicknamed Bandō Tarō (); ''Bandō'' is an obsolete alias of the Kantō ...
. The northern and western parts of the Bōsō Peninsula are highly urbanized. The
Shimōsa Plateau The 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 ...
and the coastal lowlands and interior river valleys are chiefly used for
rice Rice is the seed of the grass species ''Oryza sativa'' (Asian rice) or less commonly ''Oryza glaberrima ''Oryza glaberrima'', commonly known as African rice, is one of the two domesticated rice species. It was first domesticated and grown i ...
cultivation. The western coast of the peninsula is home to the
Keiyō Industrial Zone , also known as the Keiyō Industrial Region, the Keiyō Industrial Area, or the Keiyō Industrial Belt, is an industrial zone on the northeastern coast of Tokyo Bay that crosses 8 cities in Chiba Prefecture, Japan. The zone spans from the wester ...
, which ranges from
Urayasu 260px, old Urayasu is a city located in Chiba Prefecture, Japan. , the city had an estimated population of 170,533 in 81,136 households and a population density of . The total area of the city is . Urayasu is best known as the home of the Tokyo ...
on the border of Tokyo in the northwest of the peninsula to
Futtsu 260px, Futtsu City Hall is a city located in Chiba Prefecture, Japan. , the city had an estimated population of 42,476 in 18,115 households and a population density of 210 persons per km². The total area of the city is . Geography Futtsu is l ...
to the south. The
Tokyo Bay Aqua-Line The , also known as the Trans-Tokyo Bay Expressway, is an expressway that is mainly made up of a bridge–tunnel combination across Tokyo Bay in Japan. It connects the city of Kawasaki in Kanagawa Prefecture with the city of Kisarazu in Chiba P ...
, a
bridge A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually somethi ...
-
tunnel A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube cons ...
across Tokyo Bay, connects Kisarazu with the city of Kawasaki in
Kanagawa Prefecture is a prefecture of Japan located in the Kantō region of Honshu. Kanagawa Prefecture is the second-most populous prefecture of Japan at 9,221,129 (1 April 2022) and third-densest at . Its geographic area of makes it fifth-smallest. Kana ...
. The northeast of the peninsula is home to Suigo-Tsukuba Quasi-National Park, which spans across both Ibaraki and Chiba prefectures, and much of the remainder of the eastern coast of the peninsula is designated as
Minami Bōsō Quasi-National Park is a quasi-national park in the Kantō region of Honshū in Japan. It is rated a protected landscape (category V) according to the IUCN. The park includes numerous widely separated portions of the coastal areas of southern Bōsō Peninsula, r ...
.


Etymology

The peninsula gets its name and
kanji are the logographic Chinese characters taken from the Chinese family of scripts, Chinese script and used in the writing of Japanese language, Japanese. They were made a major part of the Japanese writing system during the time of Old Japanese ...
from the former
provinces A province is almost always an administrative division within a country or state. The term derives from the ancient Roman ''provincia'', which was the major territorial and administrative unit of the Roman Empire's territorial possessions outsi ...
that were located there:
Awa Awa (or variants) may refer to: People * Awa (given name), notable people named Awa or Hawa * Awá (Brazil), an indigenous people of Brazil * Awa-Kwaiker, an indigenous people of Colombia and Ecuador Languages * Awa language (China) or Wa (Va) ...
(安房), Kazusa (上総) and Shimōsa (下総). The
Japan Meteorological Agency The , abbreviated JMA, is an agency of the Ministry of Land, Infrastructure, Transport and Tourism. It is charged with gathering and providing results for the public in Japan that are obtained from data based on daily scientific observation an ...
refers to the west and east coasts of the peninsula as ''Uchibō'' (内房) and ''Sotobō'' (外房) respectively.


References

{{DEFAULTSORT:Boso Peninsula Landforms of Chiba Prefecture Peninsulas of Japan