Uemachi Plateau - Uemachidaichi

Japanese: 上町台地 - うえまちだいち

A plateau that runs north to south through Osaka City, jutting out like a cape 2-3km wide and 12km long from the Yamato River to the north, dividing the Osaka Plain into the Osaka Coast Lowlands and the Kawachi Lowlands. Osaka Castle (Osaka Castle) is located at the northern end. The northern part of the plateau is high, reaching an elevation of 25m, but the elevation gradually decreases to about 10m as you move south. The original shape of the plateau has been significantly altered by the construction of Naniwa Palace, Ishiyama Honganji Temple, Osaka Castle and its castle town in the early modern period, and urbanization since the late Meiji period, but many valleys have crept into the plateau ridgeline that leans to the west, and small hills are scattered here and there. Geologically, this plateau is composed of the Quaternary Osaka Group and the Upper Diluvial Layer, and is thought to form the axis of the uplifted anticline in the Osaka Tectonic Basin. During the sea level rise in the Jomon period, it was a peninsula protruding into Osaka Bay, which had intruded into the Kawachi lowlands. However, as Kawachi Bay shrunk due to sediments carried by the Yodo River and Yamato River, and as Kawachi Bay transformed from a lagoon into a lake through the Yayoi and Kofun periods and into ancient times, this high, dry plateau and the Naniwa Sand Dunes and Tenma Sand Dunes that formed to the west and north of it provided a stable place to live, making it the historical birthplace of Naniwa and Osaka.
→ Related topics Osaka [city] | Tennoji | Naniwazu

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

大阪市内を南北に走る台地で，大和(やまと)川より北に向かって幅２〜3km，長さ12kmにわたって岬状に突出し，大阪平野を大阪海岸低地と河内低地に二分する。北端には大阪城（大坂城）が位置する。台地の高度は北部が高く標高25mに達するが，南に行くに徒って高度を漸減させ10mほどになる。台地の原形は難波(なにわ)宮，石山本願寺や近世の大坂城とその城下町の建設，さらに明治後期からの市街地化により著しく改変されているが，西側に偏る台地稜線に対して多くの谷が入込み，また小高い場所が点在している。地質学上からはこの台地は第四紀の大阪層群と上部洪積層から構成され，大阪構造盆地における隆起性の背斜面軸をなすと考えられている。縄文時代における海進期にあっては，河内低地に入込んだ大阪湾内に突出する半島であったが，河内湾が淀川と大和川が運搬した堆積物によって縮小し，さらに河内湾が潟湖から湖沼へと変化する弥生・古墳時代から古代にかけて，この高燥(こうそう)な台地とその西側・北側に形成された難波砂堆(さたい)と天満砂堆の地形は安定した居住の場を提供し，難波・大坂の歴史の発祥地となった。
→関連項目大阪［市］｜天王寺｜難波津

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