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The Trebbia (stressed ''Trèbbia''; (ラテン語:Trebia)) is a river predominantly of Liguria and Emilia Romagna in northern Italy. It is one of the four main right-bank tributaries of the river Po, the other three being the Tanaro, the Secchia and the Panaro. The drainage basin is divided among Emilia Romagna, , Liguria, , and Lombardy, . Its principal tributaries are the torrents Aveto and Perino (from the right) and the torrent Boreca (from the left).〔 ==Geography== The source of the river, the Trebbia river spring, is in the Ligurian Apennines on the south slopes of Monte Prelà, to the south of Monte Antola in the ''comune'' of Torriglia, Province of Genoa. Monte Prelà, high,〔〔The other reference has .〕 is part of the Antola massif. The spring is not on the peak but is at roughly . Across a small ridge to the west, on which sits Torriglia, and slightly further downslope is the source of the Scrivia river. Over a ridge to the northeast is the Brugneto reservoir, water supply for Genoa. The reservoir was created in 1959 by damming Brugneto stream, which formerly joined its waters to the Trebbia, but now only does so when the reservoir is full. A ridge running north from Prelà connects to Monte Druso, then to Monte Cremado, and finally to Monte Antola at . From its peak on a clear day can be seen Genoa, Corsica, the Tuscan Archipelago and the Alps. From its source the river flows towards north-east for 〔The other reference has .〕 until it reaches the Po just to the west of Piacenza. The Alta Val Trebbia ("High Trebbia Valley") includes the valley down to Bobbio. It straddles eight ''comuni'' of the Province of Genoa: Torriglia, Rondanina, Propata, Fascia, Montebruno, Rovegno, Fontanigorda and Gorreto. Each of these contains numerous hamlets, some on the river, most on the slopes. Gorreto is on the Ligurian side of the border with Piacenza province. Past Gorreto the Trebbia flows under a few mountain villages arriving at the next town, Ottone. Below Ottone Val Boreca enters from the left opposite the frazione of Losso. The Boreca is a mountain brook falling from the heights of the "four provinces" region generally too small to be shown on maps but visible in satellite photographs. Just below Zerba (from which it is accessed) its waters are impounded by a dam diverting them through the turbines of a hydroelectric power station. The border with the Province of Pavia in southernmost Lombardy follows the Trebbia for about where it bends around Ponte Organasco, so that some of the river and bottom lands are in Lombardy. Further downstream the valley opens to accommodate Corte Brugnatella and then closes to form steep sides again. Receiving the Torrente Carlone from the left it enters Bobbio on the left bank. Here the high valley ends and the valley becomes the Val Trebbia. The river goes on under a good many small communities located up on the flanks of the hills before reaching the next good-sized town on it, Travo, and then Rivergaro. Here the val ends. It widens and merges with the Pianura Padana, "plain of the Po", beyond Rivergaro and a few miles later encounters the suburban communities on the west side of Piacenza before entering the Po. Geologically the course of the lower Trebbia and that of the Po is unstable except where stabilized by man. Nearly the whole course of the river is paralleled by the ''Strada statale della Val Trebbia'', highway SS45, running between Piacenza and Genoa. It encounters the river at Rivergaro and winds with it through the mountains, breaking away just below the source to bend southwest over the ridges to Genoa. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Trebbia」の詳細全文を読む スポンサード リンク
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