A low mountainous peninsula that juts out from central Kumamoto Prefecture toward the Amakusa Islands in the southwest, stretching for about 18 kilometers. It separates Shimabara Bay from the Yatsushiro Sea. Geologically, the area east of the western foot of Mt. Otake (478 meters) in the center of the peninsula is covered with volcanic rocks, and the area west of that is mostly covered with sedimentary rocks, except for the volcanic rocks of Mt. Misumi (406 meters) at the tip of the peninsula. At the base of the peninsula is an alluvial plain formed by the Midorikawa River and the Ono River. Both the northern coastline facing Shimabara Bay and the southern coastline facing the Yatsushiro Sea are monotonous, but the tip of the peninsula facing Misumi Strait is highly curved, and is blessed with good natural harbors such as Misumi Port (Uki City). The road network consists of National Route 3 running north to south at the base of the peninsula, National Route 57 along the northern coast of the peninsula, and National Route 266 along the southern coast. National Route 266 passes through Misumi Port and continues on to Amakusa. National Route 57 passes through an offshore section and leads to Shimabara. The JR Misumi Line runs parallel to National Route 57, on the inland side. Nori and clam farming is popular on the northern coast, while mandarin orange cultivation is thriving on the southern coast. The Misumicho area of Uki City at the tip of the peninsula is also the entrance to the Amakusa Pearl Line. [Yamaguchi Morito] [References] | | | |Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
熊本県中部から、南西部の天草諸島(あまくさしょとう)に向けて、長さ約18キロメートルにわたって突出している低山地性の半島。島原湾と八代海(やつしろかい)を分ける。地質的には、半島中央にある大岳(おおたけ)(478メートル)の西麓(せいろく)から以東が火山岩で、それより以西は、半島先端の三角(みすみ)岳(406メートル)による火山岩を除けば、ほとんど堆積(たいせき)岩で覆われる。半島基部には、緑川、大野川によってつくられた沖積平地がある。島原湾に臨む北海岸線も、八代海に臨む南海岸線もともに単調であるが、三角ノ瀬戸に臨む半島先端部は屈曲に富み、三角港(宇城(うき)市)のように天然の良港に恵まれている。道路網は、半島基部を南北に国道3号が、半島北岸を国道57号が、南岸を国道266号がそれぞれ走る。国道266号は三角港を通過して天草へ延びる。国道57号は海上区間を経て島原へ通じる。JR三角線は国道57号に並行しながらその内陸側を走っている。北岸はノリ、アサリ養殖、南岸はミカン栽培が盛んである。なお、半島先端部の宇城市三角町地区は天草パールラインの入口でもある。 [山口守人] [参照項目] | | | |出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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