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Speaking of the region to which Dante here alludes, Eustace, Classical Tour , I 71, says:⁠—

“The descent becomes more rapid between Roveredo and Ala; the river, which glided gently through the valley of Trent, assumes the roughness of a torrent; the defiles become narrower; and the mountains break into rocks and precipices, which occasionally approach the road, sometimes rise perpendicular from it, and now and then hang over it in terrible majesty.”