Two leagues from Kalmanstunga, in an immense lava-field, which probably originated in the Bald Jökul, are situated the renowned Surts-hellir, or caves of Surtur, the prince of darkness and fire of the ancient Scandinavian mythology. The principal entrance to the caves is an extensive chasm formed by the falling in of a part of the lava-roof; so that, on descending into it, the visitor finds himself right in the mouth of the main cavern, which runs in an almost straight line, and is nearly a mile in length. Its average height is about forty, and its breadth fifty feet. The lava-crust which forms its roof is about twelve feet thick, and has the appearance of being stratified and columnar, like basaltic pillars, in its formation. Many of the blocks of lava thus formed have become detached and fallen into the cavern, where they lie piled up in great heaps, and heavily tax the patience of the traveller, who has to scramble over the rugged stones, and can hardly avoid slipping and stumbling into the holes between them, varied by pools of water and masses of snow. But after having toiled and plodded to the extremity of this dismal cavern, his perseverance is amply rewarded by the sight of an ice-grotto, whose fairy beauty appears still more charming, in contrast with its gloomy vestibule. From the crystal floor rises group after group of transparent pillars tapering to a point, while from the roof brilliant icy pendants hang down to meet them. Columns and arches of ice are ranged along the crystalline walls, and the light of the candles is reflected back a hundred-fold from every side, till the whole cavern shines with astonishing lustre. Mr. Holland, the latest visitor of the Surts-hellir, declares he never saw a more brilliant spectacle; and the German naturalist, Preyer, pronounces it one of the most magnificent sights in nature, reminding him of the fairy grottoes of the Arabian Nights’ Tales. From the mountains and the vast plateau which occupies the centre of the island, numerous rivers descend on all sides, which, fed in summer by the melting glaciers, pour enormous quantities of turbid water into the sea, or convert large alluvial flats into morasses. Though of a considerable breadth, their course is frequently very short, particularly along the southern coast, where the jokuls from which they derive their birth are only separated from the sea by a narrow foreland. In their impetuous flow, they not seldom bear huge blocks of stone along with them, and cut off all communication between the inhabitants of their opposite banks.