Advanced Geography . peninsula extends into the sea. The body ofthe peninsula consists of a mass of rock about two miles and a halflong, known as the Bock of Gibraltar. This Bock was once anisland, but sandy waste filled in the strait at its northern end, andnow a flat neck unites the Bock with the mainland. Many of the reservoirs were built centuries ago by the Moors. This plain isfrom the Alps and the Apennines,of flood and delta plains. The melting snow and ice in the high Alps feed many of thePo branches. One of these flows from a glacier on Mont Blanc. Along the northern border of the pla
Advanced Geography . peninsula extends into the sea. The body ofthe peninsula consists of a mass of rock about two miles and a halflong, known as the Bock of Gibraltar. This Bock was once anisland, but sandy waste filled in the strait at its northern end, andnow a flat neck unites the Bock with the mainland. Many of the reservoirs were built centuries ago by the Moors. This plain isfrom the Alps and the Apennines,of flood and delta plains. The melting snow and ice in the high Alps feed many of thePo branches. One of these flows from a glacier on Mont Blanc. Along the northern border of the plain, near the foot of the Alps,are some of the Alpine lakes that are famous for their these are Como, Garda and Maggiore. These lakes lie inplaces where the country seems to have been bent down, changingparts of the river valleys into basins. Former glacial action hasaided in scouring out the lake basins, and much waste broughtdown by the ice still lies in heaps, or moraines, around the foot ofthe Monaco. The Adige river drains part of this lowland but does not join thePo. The floods of these rivers are so dangerous that long banks,or dykes, have been built to confine the water. As the streamscontinue to fill their channels with waste from the mountains, thedykes are built higher. In some places the surfaces of the riversare now higher than the plain. THE PO AND THE APENNINES. 79 The streams flowing from lakes into this lowland are clear, butthose coming directly from the mountains carry sand and finerrock waste, and are building up the plain. The marshy deltas of the Po and the Adige are rapidly growinginto the Adriatic sea. Some places that were once seaports arenow several miles inland. Along the coast, sandy islands almostinclose lagoons. The city of Venice is built on islands in one of these this city, canals partly take the place of streets. Boatscalled gondolas are seen everywhere on the canals. Irrigating canals reach almost every part of
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