The chief rivers of Iceland are, in the south, the Thiorsa and the Hvita, which are not inferior in width to the Rhine in the middle part of its course; in the north, the Skjalfandafljot and the Jökulsa and the Jökulsa i Axarfirdi, large and rapid streams above a hundred miles long; and in the east the Lagarfliot. As may be expected in a mountainous country, containing many glacier-fed rivers, Iceland has numerous cascades, many of them rivalling or surpassing in beauty the far-famed falls of Switzerland. One of the most celebrated of these gems of nature is the Goda-foss, in the northern part of the island, formed by the deep and rapid Skjalfandafljot, as it rushes with a deafening roar over rocks fifty feet high into the caldron below; but it is far surpassed in magnificence by the Dettifoss, a fall of the Jökulsa i Axarfirdi. “In some of old earth’s convulsions,” says its _discoverer_, Mr. Gould,--for from its remote situation, deep in the northern wilds of Iceland, it had escaped the curious eye of previous travellers--“the crust of rock has been rent, and a frightful fissure formed in the basalt, about 200 feet deep, with the sides columnar and perpendicular. The gash terminates abruptly at an acute angle, and at this spot the great river rolls in. The wreaths of water sweeping down; the frenzy of the confined streams where they meet, shooting into each other from either side at the apex of an angle; the wild rebound when they strike a head of rock, lurching out half way down; the fitful gleam of battling torrents, obtained through a veil of eddying vapor; the Geysir-spouts which blow up about seventy feet from holes whence basaltic columns have been shot by the force of the descending water; the blasts of spray which rush upward and burst into fierce showers on the brink, feeding rills which plunge over the edge as soon as they are born; the white writhing vortex below, with now and then an ice-green wave tearing through the foam to lash against the walls; the thunder and bellowing of the water, which make the rock shudder under foot, are all stamped on my mind with a vividness which it will take years to efface. The Almannagja is nothing to this chasm, and Schaffhausen is dwarfed by Dettifoss.”